Reproductive Biology and Endocrinology

Table 2 Relationship between nocturnal sleep duration and PTB

From: Association between sleep during pregnancy and birth outcomes: a prospective cohort study

		PTB (%)	Unadjusted		Model 1^†		Model 2^‡
		PTB (%)	OR (95% CI)		OR (95% CI)		OR (95% CI)
< 15 weeks
Sleep quality
Good		165 (73.66)	1.00 (reference)		1.00 (reference)		1.00 (reference)
Poor		59 (26.34)	1.08 (0.80,1.47)		0.96 (0.69,1.33)		0.95 (0.68,1.32)
Sleep duration (h)^b
≤ 7		53 (23.66)	1.31 (0.92,1.85)		1.28 (0.90,1.82)		1.28(0.90,1.83)
7.1-8		90 (40.18)	1.00 (reference)		1.00 (reference)		1.00 (reference)
8.1-9		54 (24.11)	0.89 (0.63,1.25)		0.90 (0.64,1.28)		0.91 (0.64,1.28)
> 9		27 (12.05)	0.89 (0.57,1.37)		0.90 (0.58,1.41)		0.90 (0.58,1.41)
24–28 weeks
Sleep quality
Good		153 (68.30)	1.00 (reference)		1.00 (reference)		1.00 (reference)
Poor		71 (31.70)	1.09 (0.82,1.45)		1.05 (0.78,1.41)		1.05 (0.78,1.40)
Sleep duration (h)
≤ 7		53 (23.66)	1.47 (1.10,1.89)		1.45 (1.11,1.88)		1.43 (1.12,1.85)
7.1-8		144 (64.29)	1.00 (reference)		1.00 (reference)		1.00 (reference)
8.1-9		21 (9.38)	0.90 (0.57,1.44)		0.93 (0.58,1.49)		0.83 (0.58,1.49)
> 9		6 (2.68)	0.75 (0.53,0.90)		0.76 (0.55,0.92)		0.79 (0.53,0.93)

Abbreviations: CI, confidence interval; OR, odds ratio; PTB, preterm birth. ^† Model 1: Adjusted for maternal age, employment, education, residence, and family income, smoking, drinking, physical activity during early pregnancy, parity, pre-pregnancy BMI, depressive and anxiety symptoms.^‡ Model 2 was adjusted for covariates in Model 1 plus HDP and GDM

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