Consultative team to assess manual handling and reduce the risk of occupational injury

The Effectiveness of Workplace Musculoskeletal Injury Risk Factor Screening Tools for Reducing Injury: A Systematic Review

INTRODUCTION

Musculoskeletal injury (MSI) contributes to global health burdens. Effective MSI prevention is necessary. MSI risk factor screening tools can be used by employers to identify and mitigate occupational hazards. Rigorous synthesis of the effectiveness of these tools has not taken place. We synthesized literature on effectiveness of MSI risk factor screening tools for reducing injury through informing prevention interventions.

MATERIALS AND METHODS

A literature search of Medline, Embase, Cochrane Library (Trials), CINAHL, Scopus and PsycINFO databases was performed. Included studies required an analytic design, used an MSI risk factor screening tool to inform an intervention in a working-age population and reported an outcome of MSI development, injury or compensation/work absence. Data extraction and study quality rating (Downs and Black criteria) were completed. Studies were sub-categorized as having used a single MSI screening tool (single-tool) to inform an injury prevention intervention or involving multiple simultaneous screening tools (multiple-tool). Study outcomes were synthesized when possible.

RESULTS

Eighteen articles representing fourteen studies met our inclusion criteria. No high-quality studies were identified (maximum Downs and Black score of 19). Studies did not employ previously validated tools but instead, typically, those purpose-built for a single use. The results were inconsistent both when using tools alone and in combination with other tools. Outcome measure heterogeneity precluded meaningful meta-analysis.

CONCLUSIONS

There is limited evidence regarding use of MSI risk factor screening tools for preventing injury. Rigorous studies that utilize previously validated tools are needed.

The prevalence of upper quadrants work-related musculoskeletal disorders and their predictors among registered nurses

BACKGROUND

Work-related musculoskeletal disorders (WMSDs) represent a significant health challenge facing nurses. However, very few studies investigated the prevalence of WMSDs among nurses and their predictors comprehensively using a valid and reliable set of standardized outcome measures.

OBJECTIVE

This study aimed to investigate the prevalence WMSDs of upper quadrants and their predictors among registered nurses in Jordanian hospitals.

METHODS

A cross-sectional study recruited 597 registered nurses from different hospitals in Jordan. A self-administered survey distributed in targeted hospitals wards. Outcome measures included Nordic Musculoskeletal Questionnaire (NMQ), Depression Anxiety Stress Scale (DASS), Pittsburgh Sleep Quality Index (PSQI), International Physical Activity Questionnaire (IPAQ), sociodemographic data, and manual handling and work habits. Prevalence of musculoskeletal complaints was reported using descriptive analysis. Logistic regression analyses were used to identify predictors of WMSDs at each upper quadrant body site.

RESULTS

Twelve-month WMSDs prevalence was the highest at the neck (61.1%), followed by the upper back (47.2%), shoulders (46.7%), wrist and hands (27.3%), and finally at the elbow (13.9%). Being a female, poor sleep quality, high physical activity level, poor ergonomics, increased workload, and mental stress were significant predictors of increased upper quadrant WMSDs among nurses.

CONCLUSIONS

Upper quadrant WMSDs among nurses in Jordan are highly prevalent. Identified significant predictors of these WMSDs should be given full consideration by clinicians and health policymakers. Future studies are needed to reveal the progressive nature of upper quadrant WMSDs and strategies to modify their risk factors.

Predictors and prevalence of lower quadrant work-related musculoskeletal disorders among hospital-based nurses: A cross-sectional study

BACKGROUND

Work-related musculoskeletal disorders (WMSDs) represent a significant problem for nurses. It is thus important to investigate nurses' WMSDs prevalence and comprehensive predictors including motor, mental, and lifestyle factors.

OBJECTIVES

To investigate the prevalence and predictors of lower quadrant WMSDs among Jordanian nurses.

METHODS

A cross-sectional design, using self-administered questionnaires, was utilized. Outcome measures included Nordic Musculoskeletal Questionnaire (NMQ), Depression Anxiety Stress Scale (DASS21), Pittsburgh Sleep Quality Index (PSQI), sociodemographic data, and self-reported work ergonomics. Descriptive analyses were used to determine lower quadrant WMSDs prevalence and regression analyses were used to assess their predictors.

RESULTS

A total of 597 nurses participated in the study. Twelve-month prevalence of lower quadrant WMSDs were 77.4% in lower back, 22.3% in hips, 37.5% in knees, and 28.5% in ankles and feet. Older age, longer years of experience, high workload, poor work habits and ergonomics, high physical activity level, availability of patient handling equipment, handling policies, stress, and anxiety were significant predictors (p< 0.05) of lower quadrant WMSDs.

CONCLUSIONS

Jordanian nurses have a high prevalence of lower quadrant WMSDs. Many modifiable risk factors of WMSDs were identified. Future studies need to design effective treatment and preventive strategies for nurses' WMSDs to improve their work efficiency and wellbeing.

A randomized controlled trial of the effect of participatory ergonomic low back pain training on workplace improvement

Objectives:

This study aimed to determine the effects of participatory workplace improvement (PWI) -based provision of ergonomic training and ergonomic action checklists (ACLs) to on-site managers on workplace improvement activities for low back pain (LBP).

Methods:

A randomized controlled trial (RCT) was conducted at a manufacturing company in Japan. Teams entered in the study were randomly assigned to a control and an intervention group. A total of three interventional training sessions on methods of ergonomics were provided to on-site managers in the intervention group, with 1-month intervals between sessions. Ergonomic ACLs were provided at the same time. After completion of the training sessions, each team then provided a report of improvements each month for the next 10 months. Two people in charge of safety and health chose two major objectives of the implemented activities from the five categories. The reported number of improvements was analyzed using a Poisson regression model.

Results:

In the intervention group, although the incident rate ratio (IRR) of PWIs in countermeasures for the LBP category was significantly elevated after the training sessions, the IRR of improvements decreased over time during the 10-month follow-up period. No significant difference was observed in the IRR of total PWIs in either the control or intervention group.

Conclusions:

PWI-based provision of ergonomic training sessions and ergonomics ACLs to on-site managers was shown to be effective for workplace improvement activities targeted at LBP. However, because the effects decrease over time, efforts should be made to maintain the effects through regular interventions.

Cost-benefit analysis of a socio-technical intervention in a Brazilian footwear company

This article presents a costs-benefits analysis of a macroergonomic intervention in a Brazilian footwear company. Comparing results of a pilot line (composed by 100 multiskilled workers organized in teams) with eight traditional lines (still working in a one human being/one task model) the intervention showed to be worth pursuing since achieved gains were higher than intervention costs: there was a reduction in human resource costs (80% reduction in industrial accidents, 100% reduction in work-related musculoskeletal disorders or WMSD, medical consultations and turnover, and a 45.65% reduction in absenteeism) and production improvement (productivity increased in 3% and production waste decrease to less than 1%). The net intervention value of the intervention was around U$ 430,000 with a benefit-to-cost ratio of 7.2. Moreover, employees who worked in the pilot line understood that their quality of work life improved, compensating the anxiety brought up by the radical changes implemented.

What constitutes effective manual handling training? A systematic review

BACKGROUND

Injuries caused by manual handling are a major burden to society. Manual handling training programmes have been designed to reduce the likelihood of injury among the workforce; however, concerns have been raised over the efficacy of current manual handling training methods.

AIMS

To undertake a systematic review of the literature examining the effectiveness of different approaches to training in manual handling.

METHODS

Peer-reviewed publications along with published conference proceedings published in English, between 1980 and 2009, on the topic of manual handling training comprised the search criteria. A published checklist for reviewing papers was selected, which formed the basis for assessing the quality of the papers reviewed.

RESULTS

A total of 1827 papers were located. Following elimination of duplicates, 221 papers were collected and reviewed. Of these, 53 papers were intervention studies with the primary aim of investigating the effectiveness of manual handling training. The review identified little evidence supporting the effectiveness of both technique- and educational-based manual handling training. In addition, there was considerable evidence supporting the idea that the principles learnt during training are not applied in the working environment. Strength and flexibility training shows promise; however, further research is needed to ascertain whether such an intervention is sustainable over the long term.

CONCLUSIONS

The evidence collected indicates that manual handling training is largely ineffective in reducing back pain and back injury. High priority should be given to developing and evaluating multidimensional interventions, incorporating exercise training to promote strength and flexibility, which are tailored to the industrial sector.

Effectiveness of participatory ergonomic interventions on health outcomes: a systematic review

The objective of this study was to conduct a systematic review of the literature on the effectiveness of participatory ergonomic (PE) interventions for improving workers' health. The search strategy targeted six electronic databases and identified 442 potential articles. Each article was examined by pairs of reviewers for relevance (assessed a participative ergonomic workplace intervention, with at least one health outcome, published in English in peer reviewed literature). Twenty-three articles met relevance criteria and were then appraised for methodological strength. Using a best evidence synthesis approach, 12 studies that were rated as 'medium' or higher provided partial to moderate evidence that PE interventions have a positive impact on: musculoskeletal symptoms, reducing injuries and workers' compensation claims, and a reduction in lost days from work or sickness absence. However, the magnitude of the effect requires more precise definition.

Evaluation of a participatory ergonomic intervention aimed at improving musculoskeletal health

BACKGROUND

Participatory ergonomic (PE) interventions have been increasingly utilized to deal with work-related musculoskeletal disorders (WMSD).

METHODS

Using a longitudinal quasi-experimental design, a PE process was launched at one depot of a large courier company, with a nearby depot serving as a control. Evaluations focused on 122 employees across the two depots who participated in both pre- and post-questionnaires. An evaluation framework assessed the process of implementation, changes in risk factors, and changes in musculoskeletal health outcomes. Partial and multiple regressions explored the relationships in the evaluation framework.

RESULTS

Changes in work organizational factors had a consistent impact upon changes in health outcomes. Greater participation in the process was associated with increased levels of job influence and communication (P = 0.0059 and P = 0.0940 respectively). Improvements in communication levels were associated with reduced pain intensity and improved work role function (WRF) (P = 0.0077 and P = 0.0248 respectively). Lower levels of pain post-intervention were related to greater WRF (P = 0.0493).

CONCLUSIONS

A PE approach can improve risk factors related to WMSD, and meaningful worker participation in the process is an important aspect for the success of such interventions.

Modeling zero-inflated count series with application to occupational health

A zero-inflated Poisson mixed autoregression model is presented for analyzing time series of count events with excess zeros. The model is motivated by the evaluation of a participatory ergonomics intervention intended to reduce manual handling workplace injuries over a specified time period. Random effects are introduced into the linear predictor of the model to account for serial correlation between successive observations. Parameter estimation is achieved by maximizing an appropriate log-likelihood function to obtain approximate residual maximum likelihood estimates. The method enables the evaluation of occupational intervention using population level aggregated count data series containing extra zeros.

A randomized and controlled trial of a participative ergonomics intervention to reduce injuries associated with manual tasks: physical risk and legislative compliance

A participative ergonomics approach to reducing injuries associated with manual tasks is widely promoted; however only limited evidence from uncontrolled trials has been available to support the efficacy of such an approach. This paper reports on a randomized and controlled trial of PErforM, a participative ergonomics intervention designed to reduce the risks of injury associated with manual tasks. One hundred and seventeen small to medium sized food, construction, and health workplaces were audited by government inspectors using a manual tasks risk assessment tool (ManTRA). Forty-eight volunteer workplaces were then randomly assigned to Experimental and Control groups with the Experimental group receiving the PErforM program. Inspectors audited the workplaces again, 9 months following the intervention. The results showed a significant decrease in estimates of manual task risk and suggested better legal compliance in the Experimental group.

A bivariate zero-inflated Poisson regression model to analyze occupational injuries

The aim of many occupational safety interventions is to reduce the incidence of injury. However, when measuring intervention effectiveness within a period, population-based accident count data typically contain a large proportion of zero observations (no injury). This situation is compounded where injuries are categorized in a binary manner according to an outcome of interest. The distribution thus comprises a point mass at zero mixed with a non-degenerate parametric component, such as the bivariate Poisson. In this paper, a bivariate zero-inflated Poisson (BZIP) regression model is proposed to evaluate a participatory ergonomics team intervention conducted within the cleaning services department of a public teaching hospital. The findings highlight that the BZIP distribution provided a satisfactory fit to the data, and that the intervention was associated with a significant reduction in overall injury incidence and the mean number of musculoskeletal (MLTI) injuries, while the decline in injuries of a non-musculoskeletal (NMLTI) nature was marginal. In general, the method can be applied to assess the effectiveness of intervention trials on other populations at high risk of occupational injury.

Effectiveness of a workplace risk assessment team in reducing the rate, cost, and duration of occupational injury

This study evaluated the effectiveness of a consultative workplace risk assessment team in reducing the rate and severity of injury among cleaners within a 600-bed hospital. Cohorts of Cleaning Services and Orderly Services staff ever employed within both a 4-year preintervention and a 3-year postintervention period were assigned to the intervention and comparison groups, respectively. The date, compensation claims' cost, and hours lost from work were obtained for each injury during the study period. Age, gender, work experience, and hours worked were ascertained for every subject whether injured or not. Reductions of two thirds in injury rate, 73% in cost rate, and 43% in duration rate were evident in the intervention group. In comparison, the orderlies experienced a postintervention increase in all three rates. The success of the workplace risk assessment team intervention supports the adoption of a participatory approach to reducing the rate and consequence of workplace injury.