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Table 2 Risk of Bias Table for Randomized Controlled Trials According to the Scottish Intercollegiate Guidelines Network (SIGN) Checklist

From: Effectiveness of non-pharmacological interventions on sleep characteristics among adults with musculoskeletal pain and a comorbid sleep problem: a systematic review

Author, Year Research Question Randomization Concealment Blinding
(1/2)
Similarity at baseline Similarity between arms Outcome measurement Percent drop-out Intention to treat Comparable results between sites
Lerman S.F. et al. 2017 [43] Y Y Y N/Y Y Y Y CBT =30%
Control =24%
Y CS
McCurry S.M. et al. 2014 [42] Y Y CS N/Y Y CS Y CBT-Pain =13.9%
CBT-Pain-Insomnia =17.2%
Control =7.3%
Y CS
Salwen J. et al., 2017 [36] Y Y Y N/Y Y Y Y Int: 30%
Contr: 24%
Y N/A
Smith M.T., et al. 2015 [32] Y Y Y N/Y Y Y Y CBT =30%
Control =24%
Y N/A
Vitiello et al. 2014 [41] Y Y CS N/Y Y CS Y CBT-Pain: 3.3%
CBT-Pain & Insomnia: 6.6%
Control: 0.8%
Y CS
Vitiello et al. 2013 [31] Y Y CS N/Y Y CS Y CBT-Pain: 9.0%
CBT-Pain & Insomnia: 11.4%
Control: 2.4%
Y CS
  1. Y Yes; N No; CS Can’t Say; N/A Not applicable. CBT cognitive behavioural therapy
  2. 1. Blinding of subjects and/or treatment providers; 2. Blinding of outcome assessors/data analysists