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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, Country

Matched or adjusted factors

Sleep Duration

Trivedi et al., [30] 2018, India

Age at pregnancy, caste, religion, occupation, literacy, and number of Ante Natal Care visits

Li et al., [31] 2017, China

Pre-pregnancy body mass index and birth weight

Kajeepeta et al., [32] 2014, Peruvian

Maternal age, pre-pregnancy weight, unplanned pregnancy, and no vitamin use during pregnancy

Guendelman et al., [12] 2013, USA

Race and month of delivery

Okun et al., [33] 2012, USA

Major depressive

disorder, selective serotonin reuptake inhibitors, age, employment, marital status, history of preterm birth

Reutrakul et al., [34] 2011, USA

Body mass index

Micheli et al., [13] 2011, Greece

Maternal age, education, parity, smoking during pregnancy, pre-pregnancy body mass index

Sleep Quality

Li et al., [31] 2017, China

Pre-pregnancy body mass index and birth weight

Ota et al., [35] 2017, Japan

Infertility treatment, asthma, and history of alcohol use

Blair et al., [36] 2015, USA

Age

Reutrakul et al., [34] 2011, USA

Body mass index

Okun et al., [14] 2011, USA

Income 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