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Table 2 cORs, aORs, and 95% CIs of obstetric complications stratified by maternal sleep duration

From: Maternal sleep duration and neonatal birth weight: the Japan Environment and Children’s Study

Obstetric outcomes

LBW infants

VLBW infants

SGA infants

Macrosomia

< 2500 g

< 1500 g

cORs and aORs (95% CI)

MSD < 6.0 h

 cORs

1.02 (0.91–1.15)

1.08 (0.68–1.72)

0.92 (0.78–1.07)

1.24 (0.89–1.72)

 Model 1

0.95 (0.83–1.08)

1.01 (0.62–1.65)

0.88 (0.75–1.02)

1.23 (0.89–1.71)

 Model 2

0.95 (0.83–1.09)

1.02 (0.62–1.67)

0.89 (0.76–1.03)

1.19 (0.86–1.66)

MSD 6.0–7.9 h

 

Ref

Ref

Ref

Ref

MSD 8.0–8.9 h

 cORs

0.92 (0.87–0.98)

0.91 (0.71–1.16)

0.96 (0.89–1.03)

1.06 (0.89–1.26)

 Model 1

0.96 (0.90–1.03)

0.95 (0.73–1.23)

0.96 (0.90–1.04)

1.01 (0.84–1.20)

 Model 2

0.97 (0.91–1.04)

0.95 (0.73–1.24)

0.97 (0.90–1.04)

0.99 (0.83–1.19)

MSD 9.0–9.9 h

 cORs

0.84 (0.78–0.91)

0.91 (0.67–1.25)

0.90 (0.82–0.99)

1.19 (0.96–1.47)

 Model 1

0.90 (0.83–0.99)

0.99 (0.71–1.37)

0.91 (0.82–0.99)

1.10 (0.89–1.36)

 Model 2

0.92 (0.84–1.00)

0.99 (0.71–1.38)

0.91 (0.83–1.00)

1.08 (0.87–1.34)

MSD 10.0–12.0 h

 cORs

0.88 (0.88–0.99)

1.19 (0.78–1.80)

0.96 (0.83–1.11)

0.92 (0.65–1.31)

 Model 1

0.86 (0.76–0.99)

1.27 (0.81–1.99)

0.95 (0.83–1.10)

0.89 (0.63–1.27)

 Model 2

0.90 (0.78–1.03)

1.31 (0.83–2.06)

0.98 (0.85–1.13)

0.86 (0.60–1.23)

  1. Abbreviations: LBW low birth weight, VLBW very low birth weight, SGA small for gestational age, MSD maternal sleep duration, Ref reference, cORs crude odds ratios, aORs adjusted odds ratios, 95% CIs 95% confidence intervals
  2. Maternal age, body mass index before pregnancy, parity, maternal smoking status, maternal alcohol consumption status, maternal educational status, annual household income, and preterm birth before 37 weeks were used as confounding factors in Model 1. Excessive gestational weight gain was added as a confounding factor (in addition to those of Model 1) in Model 2