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Table 4 Methodological quality of observational studies included in the meta-analysis

From: Association between maternal sleep duration and quality, and the risk of preterm birth: a systematic review and meta-analysis of observational studies

First author, (Ref), year

Selection

Comparability

Outcome

Cohort study

Representativeness of the exposed cohort

Selection of the non-exposed cohort

Ascertainment of exposure

Demonstration that outcome of interest was not present at start of study

Comparability of cohorts on the basis of the design or analysis

Assessment of outcome

Was follow-up long enough for outcomes to occur

Adequacy of follow up of cohorts

Trivedi et al., [30] 2018

☑

☑

☑

☑

–

☑

☑

☑

Li et al., [31] 2017

☑

☑

☑

☑

☑

☑

☑

☑

Ota et al., [35] 2017

☑

☑

☑

☑

☑

☑

☑

☑

Blair et al., [36] 2015

☑

☑

☑

☑

☑

☑

☑

☑

Guendelman et al., [12] 2013

☑

☑

☑

☑

☑

☑

☑

☑

Okun et al., [33] 2012

☑

☑

☑

☑

☑☑

☑

☑

☑

Reutrakul et al., [34] 2011

☑

☑

☑

☑

☑

☑

☑

☑

Okun et al., [14] 2011

☑

☑

☑

☑

☑

☑

☑

☑

Micheli et al., [13] 2011

☑

☑

☑

☑

☑☑

☑

☑

☑

First author, (Ref), year

Selection

Comparability

Exposure

Case-control study

Is the case definition adequate

Representativeness of the cases

Selection of Controls

Definition of Controls

Comparability of cases and controls on the basis of the design or analysis

Ascertainment of exposure

Same method of ascertainment for cases and controls

Non-Response rate

Kajeepeta et al., [32] 2014

☑

☑

☑

☑

☑☑

☑

☑

☑

  1. The risk of bias of all studies included in this meta-analysis was based on the Newcastle–Ottawa quality assessment scale
  2. The definition/explanation of each column of the Newcastle–Ottawa Scale is available at http://www.ohri.ca/programs/clinical_epidemiology/oxford.asp