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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