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Table 3 Matched or adjustment of potential confounders of 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, CountryMatched or adjusted factors
Sleep Duration
Trivedi et al., [30] 2018, IndiaAge at pregnancy, caste, religion, occupation, literacy, and number of Ante Natal Care visits
Li et al., [31] 2017, ChinaPre-pregnancy body mass index and birth weight
Kajeepeta et al., [32] 2014, PeruvianMaternal age, pre-pregnancy weight, unplanned pregnancy, and no vitamin use during pregnancy
Guendelman et al., [12] 2013, USARace and month of delivery
Okun et al., [33] 2012, USAMajor depressive
disorder, selective serotonin reuptake inhibitors, age, employment, marital status, history of preterm birth
Reutrakul et al., [34] 2011, USABody mass index
Micheli et al., [13] 2011, GreeceMaternal age, education, parity, smoking during pregnancy, pre-pregnancy body mass index
Sleep Quality
Li et al., [31] 2017, ChinaPre-pregnancy body mass index and birth weight
Ota et al., [35] 2017, JapanInfertility treatment, asthma, and history of alcohol use
Blair et al., [36] 2015, USAAge
Reutrakul et al., [34] 2011, USABody mass index
Okun et al., [14] 2011, USAIncome and medical risk factors
  1. The matched or adjustment of potential confounders of the studies included in the meta-analysis are summarized in this table