Table 1. Characteristics of participating pregnant women.

	Control (n=130)		Decision aid (n=131)
	n	%	n	%	P
Age
Mean (SD), range	31.0 (3.8), 23–41		31.3 (4.0), 20–44		0.524
Highest educational qualificationa
Low	9	6.9	7	5.4	0.571
Intermediate	39	30.0	33	25.4
High	82	63.1	90	69.2
Missing			1
Net monthly household incomeb
⩽ € 2999	36	28.3	35	27.6	0.889
⩾ € 3000	91	71.7	92	72.4
Missing	3		4
Religiosity
Religious	53	40.8	54	41.2	0.941
Not religious	77	59.2	77	58.8
Background
Dutch	115	88.5	122	93.1	0.192
Non-Dutch	15	11.5	9	6.9
Gestational age (at Q1)
Mean (SD), range	12.5 (2.4), 8–19		12.0 (2.1), 8–22		0.083
First pregnancy
Yes	54	41.5	61	46.6	0.413
No	76	58.5	70	53.4
Parity
Nulliparous	71	54.6	77	58.8	0.497
Parous	59	45.4	54	41.2
Prenatal test in (any) previous pregnancyc
Yes	24	31.6	17	24.3	0.327
No	52	68.4	53	75.7

^aLow: primary school, lower general secondary education, lower vocational education; intermediate: higher general secondary education, pre-university secondary education, higher vocational education; high: higher professional education, university.

^bDutch average net monthly household income in 2014: € 2850 (Statistics Netherlands, http://statline.cbs.nl, retrieved January 2016).

^cReported for those women with a previous pregnancy (n=146).