Table 4.

Predicting sleep problems at 30 months

	B (S.E.)	OR (95% CI)	Wald
Pregnancy/obstetric risks
Birthweight for gestational age	− 0.01 (0.002)	1.00 (0.99–1.00)	3.83
Smoking			19.50
Yes/any	− 0.34 (0.08)	1.41 (1.21–1.64)
Alcohol			0.08
> 1 unit/day	0.07 (0.25)	1.07 (0.66–1.76)
Psychosocial factors
Crowding	− 0.10 (0.05)	0.91 (0.83–1.002)	3.67
Educational attainment			26.19
Vocational	0.16 (0.12)	1.18 (0.93–1.48)
O level	− 0.17 (0.09)	0.84 (0.70–1.02)
A level	− 0.26 (0.10)	0.78 (0.64–0.95)
Degree	− 0.38 (0.12)	0.69 (0.54–0.86)
Female	− 0.11 (0.06)	0.90 (0.81–1.01)	3.49
Maternal age	− 0.02 (0.01)	0.98 (0.97–0.99)	11.12
Prenatal mood
Anxiety
18 weeks			8.79
Yes	0.33 (0.11)	1.39 (1.20–1.80)
32 weeks			0.05
Yes	0.03 (0.11)	1.03 (0.83–1.27)
Depression
18 weeks			0.004
Yes	0.01 (0.11)	1.01 (0.81–1.25)
32 weeks			12.57
Yes	0.36 (0.10)	1.43 (1.18–1.76)
Postnatal mood
Anxiety
8 weeks			3.60
Yes	0.26 (0.14)	1.30 (0.99–1.71)
8 months			1.79
Yes	0.18 (0.13)	1.20 (0.92–1.56)
Depression
8 weeks			2.64
Yes	0.20 (0.12)	1.22 (0.96–1.54)
8 months			0.39
Yes	0.08 (0.13)	1.09 (0.84–1.41)

For educational attainment, minimal education is the control condition. p < 0.05, p < 0.01, p < 0.001; n = 6829.