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Table 2 Checklist for the assessment of the methodological quality of the reviewed studies

From: Protocol for a systematic review and meta-analysis of research on the associations between workplace bullying and sleep

  Points
Part 1. Sampling and representativeness
 1. Sampling method
  A Non-probability sampling (including: purposive, quota, convenience and snowball sampling) 0
  B Probability sampling (including: simple random, systematic, stratified g, cluster, two-stage and multi-stage sampling) 1
 2. Was the response rate reported?
  A Not reported 0
  B Response rate below 50% 0
  C Response rate at 50% or above 1
 3. Are the individuals selected to participate in the study likely to be representative of the target population?
  A No 0
  B Yes 1
 4. Selection bias: Is there a risk of selection bias caused by the inadequate selection of participants
  A High risk 0
  B Low risk 1
 5. Is the sample size adequate for establishing relationships (assumption of statistical power)
  A No 0
  B Yes 1
Part 2. Measurement and confounders
 6. How was workplace bullying measured?
  A Self-labeling without definition of the bullying concept 0
  B Self-labeling with a definition of the bullying concept 1
  C Behavioral checklist (e.g., NAQ, LIPT) 1
 7. How was sleep (complaints) assessed?
  A Self-report 0
  B Objective measurement 1
 8. Performance bias: Is there a risk of performance bias caused by the inadequate measurement of exposure
  A High risk 0
  B Low risk 1
 9. Are the statistical methods appropriate for the study design?
  A No/Cannot tell 0
  B Yes 1
 10. Were meaningful demographic covariates included?
  A No 0
  B Yes 1
 11. Were other work factors adjusted for?
  A No 0
  B Yes 1
 12. Is the study design cross-sectional or prospective (with time-lag)?
  A Cross-sectional 0
  B Prospective 1
 13. Was previous sleep (complaints) adjusted for in prospective analyses?
  A No 0
  B Yes 1
 14. Confounder bias: Is there a risk of bias caused by the inadequate confirmation and consideration of confounding variable
  A High risk 0
  B Low risk 1