Table 3.

Multivariate analysis results for two definitions of unplanned pregnancy

	Main analysis(a)	p-value	Sensitivity analysis(b)	p-value
Maternal age
+ 1 year	0.94 (0.92–0.97)	<  0.001	0.95 (0.93–0.98)	<  0.001
Family structure
Nuclear family	Ref	–	Ref	–
Extended family	1.01 (0.75–1.37)	0.93	1.03 (0.77–1.38)	0.86
Other	2.76 (1.12–6.76)	0.027	3.03 (1.21–7.60)	0.018
Number of pregnancies
1–2	Ref	–	Ref	–
≥ 3	2.26 (1.66–3.08)	<  0.001	2.19 (1.62–2.97)	<  0.001
Smoking status
Never smoked	Ref	–	Ref	–
Ex-smoker	1.06 (0.77–1.45)	0.72	1.02 (0.75–1.39)	0.90
Current smoker	2.60 (1.26–5.35)	0.01	2.17 (1.06–4.45)	0.035
Balanced diet
No	Ref	–	Ref	–
Yes	0.62 (0.47–0.83)	<  0.001	0.67 (0.51–0.88)	0.004
Currently depressed
No	Ref	–	Ref	–
Yes	1.63 (1.24–2.16)	<  0.001	1.73 (1.32–2.28)	<  0.001

Pregnancy intention is measured using a single item: ‘Is this pregnancy planned?’ in (^a) and by a combination of that item and a variable gauging women’s feelings about the pregnancy in (^b). Details of the definition are described in the Methods section.

The data are presented as odds ratios with 95% confidence intervals. Ref reference