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Sample size, study length and inadequate controls were the most common self-acknowledged limitations in manual therapy trials: A methodological review

Journal: Journal of Clinical Epidemiology Date: 2020/10, . doi: Subito , type of study: review

Full text    (https://www.jclinepi.com/article/S0895-4356(20)31157-4/pdf)

Keywords:

self-acknowledged limitations [1]
guidelines [36]
manual therapy [139]
quality [141]
reporting [4]
transparency [3]
Spain [9]

Abstract:

OBJECTIVE: The aim of this study was to quantify and analyze the presence and type of self-acknowledged limitations (SALs) in a sample of manual therapy (MT) randomized controlled trials (RCTs). STUDY DESIGN AND SETTING: We randomly selected 120 MT trials. We extracted data related to SALs from the original reports and classified them into 12 categories. After data extraction, specific limitations within each category were identified. A descriptive analysis was performed using frequencies and percentages for qualitative variables. RESULTS: The number of SALs per trial article ranged from 0 to 8, and more than two thirds of trials acknowledged at least two different limitations. Despite its small proportion, 9% of trials did not report SALs. The most common limitation declared, in almost half of our sample, related to sample size (47.5%) followed by limitations related to study length and follow-up (33.3%) and inadequate controls (32.5%). CONCLUSION: Our results indicate that at least two different limitations are consistently acknowledged in MT trial reports, the most common being those related to sample size, study length and follow-up and inadequate controls. Analysis of the reasons behind the SALs gives some insights about the main difficulties in conducting research in this field and may help develop strategies to improve future research.


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