Table 3.

Predictors of sleep problems at 18 months

	B (S.E.)	OR (95% CI)	Wald
Pregnancy/obstetric risks
Birthweight for gestational age	− 0.002 (0.002)	1.00 (0.99–1.003)	0.79
Smoking			0.01
Yes/any	− 0.01 (0.08)	0.99 (0.85–1.16)
Alcohol			0.002
> 1 unit/day	− 0.01 (0.25)	0.97 (0.60–1.62)
Psychosocial factors
Crowding	0.04 (0.05)	1.05 (0.95–1.15)	0.85
Educational attainment			44.24
Vocational	− 0.08 (0.11)	0.93 (0.74–1.16)
O level	− 0.33 (0.09)	0.72 (0.60–0.86)
A level	− 0.47 (0.10)	0.62 (0.51–0.76)
Degree	− 0.64 (0.12)	0.53 (0.41–0.66)
Female	− 0.04 (0.06)	0.96 (0.86–1.07)	0.55
Maternal age	− 0.03 (0.01)	0.97 (0.96–0.99)	18.45
Prenatal mood
Anxiety
18 weeks			13.58
Yes	0.39 (0.11)	1.47 (1.20–1.80)
32 weeks			0.56
Yes	− 0.08 (0.11)	0.92 (0.75–1.14)
Depression
18 weeks			0.50
Yes	0.07 (0.10)	1.08 (0.88–1.31)
32 weeks			13.14
Yes	0.36 (0.10)	1.43 (1.18–1.73)
Postnatal mood
Anxiety
8 weeks			6.77
Yes	0.35 (0.14)	1.43 (1.09–1.86)
8 months			1.88
Yes	0.18 (0.13)	1.19 (0.93–1.54)
Depression
8 weeks			0.03
Yes	0.02 (0.12)	1.02 (0.81–1.29)
8 months			0.71
Yes	0.11 (0.13)	1.11 (0.87–1.43)

For educational attainment, minimal education is the control condition. p < 0.01, p < 0.001; n = 7458.