Development of a web-based survey for monitoring daily health and its application in an epidemiological survey

Attitudes and Behaviors Toward Cardiopulmonary Resuscitation Among Healthcare and Non-healthcare Workers in Japan: A Cross-Sectional Study Using a Web-Based Questionnaire

Background Cardiopulmonary arrest is a leading cause of death and requires swift intervention for survival. Previous studies have highlighted the critical importance of initiating cardiopulmonary resuscitation (CPR) and defibrillation within a limited timeframe. Improving outcomes depends on widespread CPR training, accessible automated external defibrillators (AEDs), and increased public awareness. Japan's universal healthcare system and accessible emergency medical services create an ideal environment for timely intervention. While global research has examined CPR hesitancy, few studies have focused on this issue in Japan. This study investigated willingness and attitudes toward CPR among various occupational groups in Japan, emphasizing the initial steps in responding to cardiopulmonary arrest. Objective This study explored the willingness and attitudes toward CPR among diverse occupational groups in Japan, focusing on the initial steps in responding to patients with cardiopulmonary arrest. Methods A cross-sectional survey was conducted through an Internet panel research company. Participants, stratified by occupation, age, and sex, completed a web-based questionnaire on CPR knowledge and willingness to act in a cardiac arrest scenario. Data were analyzed using univariate and multivariate linear regressions to identify factors influencing CPR attitudes and behaviors. Results Data from 1,648 respondents revealed differences in CPR attitudes and behaviors based on sex and occupational group. High resuscitation skills increased the likelihood of action, whereas concerns and worries reduced it. Self-evaluation of skills had a less significant effect. Variations existed in performing artificial respiration, with concerns about specific techniques influencing decisions. Multivariate regression analysis demonstrated an inverse relationship between the likelihood of action and worries about resuscitation. Sex and moral values also affected responses. Male medical doctors and nurses with lower moral values and higher resuscitation concerns were less likely to take action. However, they were more inclined to assist if the patient was familiar rather than unfamiliar. Conclusions The study identified notable differences in willingness and attitudes toward CPR between medical professionals (e.g., doctors and nurses) and non-medical professionals (e.g., the general public and care workers) as well as between men and women. Non-medical professionals were more likely to seek help when concerned about resuscitation techniques, whereas medical professionals showed hesitation due to worries about their performance. Women with uncertainties about resuscitation procedures were less likely to assist despite demonstrating a strong moral sense.

Consumer Willingness to Pay for Food Defense and Food Hygiene in Japan: Cross-Sectional Study

BACKGROUND

In Japan, incidents of falsified expiration dates on popular cookie brands and health hazards associated with frozen Chinese dumplings have raised food safety awareness. To prevent the intentional contamination of food by foreign substances, large food manufacturing companies have adopted the concept of food defense.

OBJECTIVE

The aim of this study was to assess people's willingness to pay for food protection measures. In addition, the impact of participants' personalities and considerations regarding their purchase choices on how much they were willing to pay when shopping for food and other products were measured.

METHODS

A questionnaire on willingness to pay for food hygiene and food defense was administered via a web survey and 1414 responses were included in the analysis. Univariate logistic regression analyses were performed with individuals willing and unwilling to pay additional costs as the objective variable and other questionnaire items as explanatory variables. A principal component analysis was performed on 12 questions regarding how much additional money people were willing to pay, and the principal component scores and other questions were examined for implications and other information.

RESULTS

Approximately one-third of the respondents stated that they were unwilling to pay additional costs and reported a willingness to consume delivery food even if it contained items that were not part of the original order. The first principal component reflected the extent to which people were willing to pay additional money, and if so, how much. This tendency existed even if the individual foods and amounts varied. The third principal component reflected the amount of extra money that people were willing to pay, which was determined by the amount people had to pay toward food safety measures. Those who answered "zero" were more likely to believe that consumers should not have to pay to ensure food safety. The second principal component reflected an axis separating food defense and food hygiene. Some items not directly related to food were correlated with this axis.

CONCLUSIONS

In Japan, the concept of food hygiene is well-established and is generally taken for granted. In contrast, the concept of food defense is relatively new and has not yet fully penetrated the Japanese market. Our research shows that people who think that clothing brands provided added value to clothing products may have similar feelings about food defense. In addition, food hygiene efforts to prevent outbreaks of food poisoning are common in Japan and have been established as the basis of food safety. While food defense efforts are spreading, mainly in companies, it is presumed that they are valuable for the general public as supplementary measures to routine (or basic) food hygiene.

Consumer Awareness of Food Defense Measures at Food Delivery Service Providers and Food Manufacturers: Web-Based Consumer Survey Study

BACKGROUND

Various stages of the food chain, from production to processing to distribution, can impact food safety. The concept of "food defense" has emerged as a countermeasure against intentional contamination of food with foreign substances. Although knowledge of food hygiene is common among consumers, there are currently no reports of consumer surveys on food defense.

OBJECTIVE

This study aims to investigate consumer awareness of food defense and food safety. We analyzed the results focusing on how consumers behave when they find abnormalities in food to further our knowledge on promoting food defense measures.

METHODS

Participants completed a web-based questionnaire that included items related to awareness of food safety and food defense, as well as actions to be taken in cases of food abnormalities, such as contamination by foreign substances, the presence of a bad smell in purchased food, and the inclusion of extra items not selected by the individual. The participants were asked to indicate their preference among the 5 suggested actions in each case using a 6-point Likert scale. Data analysis involved aggregating responses into binary values. Stepwise linear regression analysis was conducted to examine the relationship between selected actions and questionnaire items, such as sex, age, and personality.

RESULTS

A total of 1442 respondents completed the survey, and the majority of participants placed importance on food safety when making food purchases. The recognition of each term was as follows: 95.2% (n=1373) for "food security and safety," 95.6% (n=1379) for "food hygiene," and 17.1% (n=247) for "food defense." The percentages of those who answered that they would "eat without worrying" in the case of "contamination by foreign substances," "bad smell," or "including unpurchased product" in the frozen food they purchased were 9.1% (n=131), 4.8% (n=69), and 30.7% (n=443), respectively. The results showed that contacting the manufacturer was the most common action when faced with contaminated food or food with a bad smell. Interestingly, a significant percentage of respondents indicated they would upload the issue on social networking sites. Logistic regression analysis revealed that male participants and the younger generation were more likely to choose the option of eating contaminated food without worrying. Additionally, the tendency to upload the issue on social networking sites was higher among respondents who were sociable and brand-conscious.

CONCLUSIONS

The findings of this study indicate that if food intentionally contaminated with a foreign substance is sold and delivered to consumers, it is possible consumers may eat it and experience health problems. Therefore, it is crucial for not only food manufacturers but also food delivery service providers to consider food defense measures such as protecting food from intentional contamination. Additionally, promoting consumer education and awareness regarding food defense can contribute to enhancing food safety throughout the food chain.

Prevalence of xerostomia with or without overactive bladder symptoms

Overactive bladder (OAB) occurs idiopathic or secondary to a neurological cause. In addition, OAB may also occur due to xerostomia, because it causes excessive drinking of water. If xerostomia is one of the causes of OAB, treating xerostomia may be effective. This study aimed to investigate the prevalence of xerostomia with or without overactive bladder symptoms. A web-based questionnaire was administered to investigate the prevalence of xerostomia with or without overactive bladder symptoms. The survey included questions concerning age, gender, medical history, medications, OAB symptoms by the Overactive Bladder Symptom Score (OABSS), and xerostomia by the Dry Mouth Scale (DMS). From the analysis, a total of 21 (13.0%) participants were identified as having OAB. The prevalence of xerostomia was six (28.6%) in the OAB group and 14 (10.0%) in the non-OAB group. OABSS and DMS were significantly higher in the OAB group than in the non-OAB group. Urgency score and urgency incontinence score of OABSS were substantially higher in xerostomia participants than non-xerostomia participants. The adjusted odds ratio of OAB showed DMS total score, xerostomia symptoms, accompanying symptoms, and other symptoms that were all significantly associated with OAB. These results suggested that OAB subjects, even untreated subjects, had xerostomia. It may be beneficial for clinicians to perform dry mouth management in parallel with careful choice pharmacotherapy for the wellness of OAB patients.

Long-Term Health Effects of PCBs and Related Compounds: A Comparative Analysis of Patients Suffering from Yusho and the General Population

Yusho, which refers to a mass poisoning caused by the ingestion of rice bran oil contaminated with polychlorinated biphenyls, polychlorinated dibenzo-p-dioxins, and polychlorinated dibenzofurans, was first reported in October 1968 in Japan. Yusho patients suffer from various symptoms; however, after 40 years, some emerging symptoms have been attributed to aging. The prevalence of symptoms and diseases among Yusho patients and the general population was compared in this study. The data obtained from the survey among Yusho patients (1131 patients) by the Ministry of Health, Labour, and Welfare of Japan in 2008 were compared with the data from a survey conducted among the general population. When selecting the comparison group, the age and residential area (prefecture) were taken into account to match the baseline characteristics of Yusho patients. A logistic regression analysis was performed to identify the association between Yusho and the prevalence of symptoms and was adjusted for various potential confounding factors (age, sex, body mass index, cigarette smoking, frequency of drinking, and walking time). Skin pigmentation and acneiform eruption were found to be characteristic symptoms of Yusho and were more prevalent in these patients. Other symptoms and diseases associated with Yusho included orthostatic hypotension, hypohidrosis, dysgeusia, Basedow's disease, hoarseness, cardiac insufficiency, tachycardia, eczema, and hair loss. Symptoms related to aging, such as general fatigue, arthralgia, and numbness in the extremities, were significantly higher in Yusho patients after adjusting for age and lifestyle. This study demonstrated that, 40 years after the outbreak of Yusho, the prevalence of various symptoms and diseases in Yusho patients, including age-related diseases, was higher than that in the general population.

Insights From Flutracking: Thirteen Tips to Growing a Web-Based Participatory Surveillance System

Flutracking is a weekly Web-based survey of influenza-like illness (ILI) in Australia that has grown from 400 participants in 2006 to over 26,000 participants every week in 2016. Flutracking monitors both the transmission and severity of ILI across Australia by documenting symptoms (cough, fever, and sore throat), time off work or normal duties, influenza vaccination status, laboratory testing for influenza, and health seeking behavior. Recruitment of Flutrackers commenced via health department and other organizational email systems, and then gradually incorporated social media promotion and invitations from existing Flutrackers to friends to enhance participation. Invitations from existing participants typically contribute to over 1000 new participants each year. The Flutracking survey link was emailed every Monday morning in winter and took less than 10 seconds to complete. To reduce the burden on respondents, we collected only a minimal amount of demographic and weekly data. Additionally, to optimize users' experiences, we maintained a strong focus on "obvious design" and repeated usability testing of naïve and current participants of the survey. In this paper, we share these and other insights on recruitment methods and user experience principles that have enabled Flutracking to become one of the largest online participatory surveillance systems in the world. There is still much that could be enhanced in Flutracking; however, we believe these principles could benefit others developing similar online surveillance systems.

Protein-Based Bioelectronics

The desire for flexible electronics is booming, and development of bioelectronics for health monitoring, internal body procedures, and other biomedical applications is heavily responsible for the growing market. Most current fabrication techniques for flexible bioelectronics, however, do not use materials that optimize both biocompatibility and mechanical properties. This Review explores flexible electronic technologies, fabrication methods, and protein materials for biomedical applications. With favorable sustainability and biocompatibility, naturally derived proteins are an exceptional alternative to synthetic materials currently used. Many proteins can take on various forms, such as fibers, films, and scaffolds. The fabrication of resistors and organic solar cells on silk has already been proven, and optoelectronics made of collagen and keratin have also been explored. The flexibility and biocompatibility of these materials along with their proven performance in electronics make them ideal materials in the advancement of biomedical devices.

Relationship Between Difficulties in Daily Activities and Falling: Loco-Check as a Self-Assessment of Fall Risk

Background

People aged 65 years or older accounted for 25.1% of the Japanese population in 2013, and this characterizes the country as a “super-aging society.” With increased aging, fall-related injuries are becoming important in Japan, because such injuries underlie the necessity for nursing care services. If people could evaluate their risk of falling using a simple self-check test, they would be able to take preventive measures such as exercise, muscle training, walking with a cane, or renovation of their surroundings to remove impediments. Loco-check is a checklist measure of early locomotive syndrome (circumstances in which elderly people need nursing care service or are at high risk of requiring the service within a short time), prepared by the Japanese Orthopaedic Association (JOA) in 2007, but it is unclear if there is any association between this measure and falls.

Objective

To investigate the association between falls during the previous year and the 7 “loco-check” daily activity items and the total number of items endorsed, and sleep duration.

Methods

We conducted an Internet panel survey. Subjects were 624 persons aged between 30 and 90 years. The general health condition of the participants, including their experience of falling, daily activities, and sleep duration, was investigated. A multivariate analysis was carried out using logistic regression to investigate the relationship between falls in the previous year and difficulties with specific daily activities and total number of difficulties (loco-check) endorsed, and sleep duration, adjusting for sex and age.

Results

One-fourth of participants (157 persons) experienced at least one fall during the previous year. Fall rate of females (94/312: 30.1%) was significantly higher than that of males (63/312: 20.2%). Fall rate of persons aged more than 65 years (80/242: 33.1%) was significantly higher than that of younger persons (77/382: 20.2%). Logistic regression analysis revealed that daily activities such as “impossibility of getting across the road at a crossing before the traffic light changes” are significantly related to falling. Logistic regression analysis also demonstrated a relationship between the number of items endorsed on loco-check and incidence of falling, wherein persons who endorsed 4 or more items appear to be at higher risk for falls. However, logistic regression found no significant relationship between sleep duration and falling.

Conclusions

Our study demonstrated a relationship between the number of loco-check items endorsed and the incidence of falling in the previous year. Endorsement of 4 or more items appeared to signal a high risk for falls. The short self-administered checklist can be a valuable tool for assessing the risk of falling and for initiating preventive measures.

Web Health Monitoring Survey: A New Approach to Enhance the Effectiveness of Telemedicine Systems

BACKGROUND

Aging of the European population and interest in a healthy population in western countries have contributed to an increase in the number of health surveys, where the role of survey design, data collection, and data analysis methodology is clear and recognized by the whole scientific community. Survey methodology has had to couple with the challenges deriving from data collection through information and communications technology (ICT). Telemedicine systems have not used patients as a source of information, often limiting them to collecting only biometric data. A more effective telemonitoring system would be able to collect objective and subjective data (biometric parameters and symptoms reported by the patients themselves), and to control the quality of subjective data collected: this goal be achieved only by using and merging competencies from both survey methodology and health research.

OBJECTIVE

The objective of our study was to propose new metrics to control the quality of data, along with the well-known indicators of survey methodology. Web questionnaires administered daily to a group of patients for an extended length of time are a Web health monitoring survey (WHMS) in a telemedicine system.

METHODS

We calculated indicators based on paradata collected during a WHMS study involving 12 patients, who signed in to the website daily for 2 months.

RESULTS

The patients' involvement was very high: the patients' response rate ranged between 1.00 and 0.82, with an outlier of 0.65. Item nonresponse rate was very low, ranging between 0.0% and 7.4%. We propose adherence to the chosen time to connect to the website as a measure of involvement and cooperation by the patients: the difference from the median time ranged between 11 and 24 minutes, demonstrating very good cooperation and involvement from all patients. To measure habituation to the questionnaire, we also compared nonresponse rates to the items between the first and the second month of the study, and found no significant difference. We computed the time to complete the questionnaire both as a measure of possible burden for patient, and to detect the risk of automatic responses. Neither of these hypothesis was confirmed, and differences in time to completion seemed to depend on health conditions. Focus groups with patients confirmed their appreciation for this "new" active role in a telemonitoring system.

CONCLUSIONS

The main and innovative aspect of our proposal is the use of a Web questionnaire to virtually recreate a checkup visit, integrating subjective (patient's information) with objective data (biometric information). Our results, although preliminary and if need of further study, appear promising in proposing more effective telemedicine systems. Survey methodology could have an effective role in this growing field of research and applications.

Development and Application of an Alert System to Detect Cases of Food Poisoning in Japan

Recent public health concerns regarding commercial food products have increased the need to develop an automated method to detect food product-related health events. We developed and verified a method for the early detection of potentially harmful events caused by commercial food products. We collected data from daily internet-based questionnaires examining the presence or absence of symptoms and information about food purchased by the respondents. Using these data, we developed a method to detect possible health concerns regarding commercialized food products. To achieve this, we combined the signal detection method used in the reporting system of adverse effects of pharmaceutical products and the Early Aberration Reporting System (EARS) used by the United States Centers for Disease Control. Whiteleg shrimp (Litopenaeus vannamei), which had odds ratio and Odds(−) of 8.99 and 4.13, respectively, was identified as a possible causative food product for diarrhea and vomiting. In conclusion, this study demonstrated that food distributors can implement post-marketing monitoring of the safety of food products purchased via the internet.

The wisdom of crowds in action: Forecasting epidemic diseases with a web-based prediction market system

BACKGROUND

The quest for an effective system capable of monitoring and predicting the trends of epidemic diseases is a critical issue for communities worldwide. With the prevalence of Internet access, more and more researchers today are using data from both search engines and social media to improve the prediction accuracy. In particular, a prediction market system (PMS) exploits the wisdom of crowds on the Internet to effectively accomplish relatively high accuracy.

OBJECTIVE

This study presents the architecture of a PMS and demonstrates the matching mechanism of logarithmic market scoring rules. The system was implemented to predict infectious diseases in Taiwan with the wisdom of crowds in order to improve the accuracy of epidemic forecasting.

METHODS

The PMS architecture contains three design components: database clusters, market engine, and Web applications. The system accumulated knowledge from 126 health professionals for 31 weeks to predict five disease indicators: the confirmed cases of dengue fever, the confirmed cases of severe and complicated influenza, the rate of enterovirus infections, the rate of influenza-like illnesses, and the confirmed cases of severe and complicated enterovirus infection.

RESULTS

Based on the winning ratio, the PMS predicts the trends of three out of five disease indicators more accurately than does the existing system that uses the five-year average values of historical data for the same weeks. In addition, the PMS with the matching mechanism of logarithmic market scoring rules is easy to understand for health professionals and applicable to predict all the five disease indicators.

CONCLUSIONS

The PMS architecture of this study affords organizations and individuals to implement it for various purposes in our society. The system can continuously update the data and improve prediction accuracy in monitoring and forecasting the trends of epidemic diseases. Future researchers could replicate and apply the PMS demonstrated in this study to more infectious diseases and wider geographical areas, especially the under-developed countries across Asia and Africa.

Nonprobability Web surveys to measure sexual behaviors and attitudes in the general population: a comparison with a probability sample interview survey

Background

Nonprobability Web surveys using volunteer panels can provide a relatively cheap and quick alternative to traditional health and epidemiological surveys. However, concerns have been raised about their representativeness.

Objective

The aim was to compare results from different Web panels with a population-based probability sample survey (n=8969 aged 18-44 years) that used computer-assisted self-interview (CASI) for sensitive behaviors, the third British National Survey of Sexual Attitudes and Lifestyles (Natsal-3).

Methods

Natsal-3 questions were included on 4 nonprobability Web panel surveys (n=2000 to 2099), 2 using basic quotas based on age and sex, and 2 using modified quotas based on additional variables related to key estimates. Results for sociodemographic characteristics were compared with external benchmarks and for sexual behaviors and opinions with Natsal-3. Odds ratios (ORs) were used to express differences between the benchmark data and each survey for each variable of interest. A summary measure of survey performance was the average absolute OR across variables. Another summary measure was the number of key estimates for which the survey differed significantly (at the 5% level) from the benchmarks.

Results

For sociodemographic variables, the Web surveys were less representative of the general population than Natsal-3. For example, for men, the average absolute OR for Natsal-3 was 1.14, whereas for the Web surveys the average absolute ORs ranged from 1.86 to 2.30. For all Web surveys, approximately two-thirds of the key estimates of sexual behaviors were different from Natsal-3 and the average absolute ORs ranged from 1.32 to 1.98. Differences were appreciable even for questions asked by CASI in Natsal-3. No single Web survey performed consistently better than any other did. Modified quotas slightly improved results for men, but not for women.

Conclusions

Consistent with studies from other countries on less sensitive topics, volunteer Web panels provided appreciably biased estimates. The differences seen with Natsal-3 CASI questions, where mode effects may be similar, suggest a selection bias in the Web surveys. The use of more complex quotas may lead to some improvement, but many estimates are still likely to differ. Volunteer Web panels are not recommended if accurate prevalence estimates for the general population are a key objective.

Association between first airborne cedar pollen level peak and pollinosis symptom onset: a web-based survey

Cedar pollinosis in Japan affects nearly 25 % of Japanese citizens. To develop a treatment for cedar pollinosis, it is necessary to understand the relationship between the time of its occurrence and the amount of airborne cedar pollen. In the spring of 2009, we conducted daily Internet-based epidemiologic surveys, which included 1453 individuals. We examined the relationship between initial date of onset of pollinosis symptoms and daily amount of airborne cedar pollen to which subjects were exposed. Approximately 35.2 % of the subjects experienced the onset of pollinosis during a one-week interval in which the middle day coincided with the peak pollen count. The odds ratio for this one-week time interval was 4.03 (95 % confidence interval: 3.34-4.86). The predicted date of the cedar pollen peak can be used to determine the appropriate date for initiation of self-medication with anti-allergy drugs and thus avoid development of sustained and severe pollinosis.

Comparison of US panel vendors for online surveys

Background

Despite the increasing use of panel surveys, little is known about the differences in data quality across panels.

Objective

The aim of this study was to characterize panel survey companies and their respondents based on (1) the timeliness of response by panelists, (2) the reliability of the demographic information they self-report, and (3) the generalizability of the characteristics of panelists to the US general population. A secondary objective was to highlight several issues to consider when selecting a panel vendor.

Methods

We recruited a sample of US adults from 7 panel vendors using identical quotas and online surveys. All vendors met prespecified inclusion criteria. Panels were compared on the basis of how long the respondents took to complete the survey from time of initial invitation. To validate respondent identity, this study examined the proportion of consented respondents who failed to meet the technical criteria, failed to complete the screener questions, and provided discordant responses. Finally, characteristics of the respondents were compared to US census data and to the characteristics of other panels.

Results

Across the 7 panel vendors, 2% to 9% of panelists responded within 2 days of invitation; however, approximately 20% of the respondents failed the screener, largely because of the discordance between self-reported birth date and the birth date in panel entry data. Although geographic characteristics largely agreed with US Census estimates, each sample underrepresented adults who did not graduate from high school and/or had annual incomes less than US $15,000. Except for 1 vendor, panel vendor samples overlapped one another by approximately 20% (ie, 1 in 5 respondents participated through 2 or more panel vendors).

Conclusions

The results of this head-to-head comparison provide potential benchmarks in panel quality. The issues to consider when selecting panel vendors include responsiveness, failure to maintain sociodemographic diversity and validated data, and potential overlap between panels.

Prevalence of insomnia among residents of Tokyo and osaka after the great East Japan earthquake: a prospective study

Background

The Great East Japan Earthquake occurred on March 11, 2011. Tokyo and Osaka, which are located 375 km and 750 km, respectively, from the epicenter, experienced tremors of 5.0 lower and 3.0 seismic intensity on the Japan Meteorological Agency scale. The Great East Japan Earthquake was the fourth largest earthquake in the world and was accompanied by a radioactive leak at a nuclear power plant and a tsunami. In the aftermath of a disaster, some affected individuals presented to mental health facilities with acute stress disorder (ASD) and/or post-traumatic stress disorder (PTSD). However, few studies have addressed mental stress problems other than ASD or PTSD among the general public immediately after a disaster. Further, the effects of such a disaster on residents living at considerable distances from the most severely affected area have not been examined.

Objective

This study aimed to prospectively analyze the effect of a major earthquake on the prevalence of insomnia among residents of Tokyo and Osaka.

Methods

A prospective online questionnaire study was conducted in Tokyo and Osaka from January 20 to April 30, 2011. An Internet-based questionnaire, intended to be completed daily for a period of 101 days, was used to collect the data. All of the study participants lived in Tokyo or Osaka and were Consumers’ Co-operative Union (CO-OP) members who used an Internet-based food-ordering system. The presence or absence of insomnia was determined before and after the earthquake. These data were compared after stratification for the region and participants’ age. Multivariate analyses were conducted using logistic regression and a generalized estimating equation. This study was conducted with the assistance of the Japanese CO-OP.

Results

The prevalence of insomnia among adults and minors in Tokyo and adults in Osaka increased significantly after the earthquake. No such increase was observed among minors in Osaka. The overall adjusted odds ratios for the risk of insomnia post-earthquake versus pre-earthquake were 1.998 (95% CI 1.571–2.542) for Tokyo, 1.558 (95% CI 1.106–2.196) for Osaka, and 1.842 (95% CI,1.514–2.242) for both areas combined.

Conclusions

The prevalence of insomnia increased even in regions that were at a considerable distance from the epicenter. Both adults and minors in Tokyo, where the seismic intensity was greater, experienced stress after the earthquake. In Osaka, where the earthquake impact was milder, disturbing video images may have exacerbated insomnia among adults.

Real-time prescription surveillance and its application to monitoring seasonal influenza activity in Japan

Background

Real-time surveillance is fundamental for effective control of disease outbreaks, but the official sentinel surveillance in Japan collects information related to disease activity only weekly and updates it with a 1-week time lag.

Objective

To report on a prescription surveillance system using electronic records related to prescription drugs that was started in 2008 in Japan, and to evaluate the surveillance system for monitoring influenza activity during the 2009–2010 and 2010–2011 influenza seasons.

Methods

We developed an automatic surveillance system using electronic records of prescription drug purchases collected from 5275 pharmacies through the application service provider’s medical claims service. We then applied the system to monitoring influenza activity during the 2009–2010 and 2010–2011 influenza seasons. The surveillance system collected information related to drugs and patients directly and automatically from the electronic prescription record system, and estimated the number of influenza cases based on the number of prescriptions of anti-influenza virus medication. Then it shared the information related to influenza activity through the Internet with the public on a daily basis.

Results

During the 2009–2010 influenza season, the number of influenza patients estimated by the prescription surveillance system between the 28th week of 2009 and the 12th week of 2010 was 9,234,289. In the 2010–2011 influenza season, the number of influenza patients between the 36th week of 2010 and the 12th week of 2011 was 7,153,437. The estimated number of influenza cases was highly correlated with that predicted by the official sentinel surveillance (r = .992, P < .001 for 2009–2010; r = .972, P < .001 for 2010–2011), indicating that the prescription surveillance system produced a good approximation of activity patterns.

Conclusions

Our prescription surveillance system presents great potential for monitoring influenza activity and for providing early detection of infectious disease outbreaks.