Table 2.

Unadjusted and adjusted odds ratios (OR) with 95% confidence intervals (CI) for hyperemesis gravidarum (n = 611, 0.9%) among 69,864 pregnancies

	Unadjusted OR (95% CI)	P value	Adjusted OR (95% CI)	P value
History of depression
No	1	–	1	–
Yes	1.53 (1.29; 1.83)	< 0.001	1.49 (1.23; 1.79)	<0.001
Symptoms of current depression
Low score	1	–	1	–
High score	2.11 (1.65; 2.69)	< 0.001	1.71 (1.31; 2.23)	<0.001
Maternal age	0.94 (0.93; 0.96)	< 0.001	0.93 (0.91; 0.95)	<0.001
Parity
Primipara	1	–	1	–
Multipara	1.24 (1.05; 1.45)	0.010	1.43 (1.20; 1.69)	<0.001
Length of education (years)
<12	2.42 (1.76; 3.32)	< 0.001	1.91 (1.36; 2.69)	<0.001
13–16	1.64 (1.31; 2.06)	< 0.001	1.44 (1.13; 1.82)	0.003
>16	1	–	1	–
Pre-pregnancy BMI	1.03 (1.01; 1.04)	0.002	1.02 (1.00; 1.04)	0.030
Smoking
No	1	–	1	–
Yes	0.60 (0.49; 0.72)	<0.001	0.46 (0.37; 0.56)	<0.001
Sex of the child
Boy	1	–	1	–
Girl	1.49 (1.27; 1.75)	<0.001	1.50 (1.28; 1.76)	<0.001
Pelvic girdle pain
No	1	–	1	–
Yes	1.52 (1.25; 1.85)	<0.001	1.30 (1.06; 1.59)	0.011