'Spin' among abstracts of randomised controlled trials in sleep medicine: A research-on-research study

Spin Bias in randomized controlled trials of botulinum toxin for bruxism management: a meta-epidemiologic study

OBJECTIVE

To perform a quantitative and qualitative analysis of spin bias in randomized clinical trials (RCTs) focusing on botulinum toxin (BTX-A) for managing bruxism.

STUDY DESIGN AND PROTOCOL

This is a meta-epidemiologic study. The protocol was registered on the Open Science Framework.

STUDY SELECTION

We included RCTs that evaluated the effectiveness of BTX-A for managing bruxism, associated or not with signs and symptoms of temporomandibular disorders. The outcomes were changes in pain and bruxism events. Spin bias was investigated in abstract and main text. The frequency of spin bias was assessed, and a qualitative analysis was conducted. The study was classified as effective if the outcome analyzed was statistically significant (p-value 0.05) and reached the minimum important difference of 20% and ineffective if the reported outcome was statistically nonsignificant or the study did not report the p-value or the results did not reach the minimum important difference of 20%.

RESULTS

An overall frequency of 59.4% spin bias was identified in eight included RCTs. The conclusion in the main text (87.5%) was the section with the highest frequency of spin bias. In the qualitative analysis, the most common strategies identified were inadequate extrapolation to a large population (30.61%), inadequate implication for clinical practice (20.41%), and misleading reporting (12.25%).

CONCLUSION

There is a high frequency of spin bias in RCTs that evaluated BTX-A for bruxism management. Close to 90% of the selected RCTs presented spin bias in the main text's conclusion. The most common spin was the inadequate extrapolation of the results.

CLINICAL SIGNIFICANCE

Applying BTX into the temporalis did not reduce muscle activity and the results for masseter injections remain controversial. It seems that BTX-A injections can reduce pain from two weeks to one year. It is not possible to have certainty about the efficacy and safety of using BTX-A to reduce pain and bruxism events.

Abstracts of randomized controlled trials in splint therapy for temporomandibular disorders: Reporting quality and spin

BACKGROUND

Poor reporting quality and spin in randomized controlled trial (RCT) abstracts can lead to misinterpretation and distorted interpretation of results.

OBJECTIVES

This methodological study aimed to assess the reporting quality and spin among RCT abstracts on splint therapy for temporomandibular disorders (TMD) and explore the association between spin and potentially related factors.

METHODS

The authors searched PubMed for RCTs on splint therapy for TMD. The reporting quality of each abstract was assessed using the original 16-item CONSORT for abstracts checklist. The authors evaluated the presence and characteristics of spin only in abstracts with nonsignificant primary outcomes according to pre-determined spin strategies. Logistic regression analyses were performed to identify factors associated with the presence of spin.

RESULTS

A total of 148 abstracts were included in the reporting quality evaluation. The mean overall CONSORT score (OCS) was 5.86 (score range: 0-16). Only interventions, objectives and conclusions were adequately reported. Of the 61 RCT abstracts included for spin analysis, spin was identified in 38 abstracts (62.3%), among which 32 abstracts (52.3%) had spin in the Results section and 21 (34.4%) had spin in the Conclusions section. A significantly lower presence of spin was found in studies with exact p-value reporting (OR: 0.170; 95% CI: 0.032-0.887; p = .036) and a two-arm comparison design (OR: 11.777; 95% CI: 2.171-63.877; p = .004).

CONCLUSIONS

The reporting quality of RCT abstracts on splint therapy for TMD is suboptimal and the prevalence of spin is high. More awareness and joint efforts are needed to improve reporting quality and minimize spin.

Abstracts of randomized controlled trials in pediatric dentistry: reporting quality and spin

BACKGROUND

Abstracts provide readers a concise and readily accessible information of the trials. However, poor reporting quality and spin (misrepresentation of research findings) can lead to an overestimation in trial validity. This methodological study aimed to assess the reporting quality and spin among randomized controlled trial (RCT) abstracts in pediatric dentistry.

METHODS

We hand-searched RCTs in five leading pediatric dental journals between 2015 and 2021. Reporting quality in each abstract was assessed using the original 16-item CONSORT for abstracts checklist. Linear regression analyses were performed to identify factors associated with reporting quality. We evaluated the presence and characteristics of spin only in abstracts of parallel-group RCTs with nonsignificant primary outcomes according to pre-determined spin strategies.

RESULTS

One hundred eighty-two abstracts were included in reporting quality evaluation. The mean overall quality score was 4.57 (SD, 0.103; 95% CI, 4.36-4.77; score range, 1-10). Only interventions, objective, and conclusions were adequately reported. Use of flow diagram (P < 0.001) was the only significant factor of higher reporting quality. Of the 51 RCT abstracts included for spin analysis, spin was identified in 40 abstracts (78.4%), among which 23 abstracts (45.1%) had spin in the Results section and 39 in the Conclusions Sect. (76.5%).

CONCLUSIONS

The reporting quality of RCT abstracts in pediatric dentistry is suboptimal and the prevalence of spin is high. Joint efforts are needed to improve reporting quality and minimize spin.