TABLE 1.

Sociodemographic characteristics of questionnaire participants

	All (n = 352)	Study site one (n = 171)	Study site two (n = 181)	P
Age, n (%) (years)
<18	0 (0.0)	0 (0.0)	0 (0.0)	0.31
18–25	20 (5.7)	7 (4.1)	13 (7.2)
26–35	282 (80.8)	144 (84.2)	138 (76.2)
36–45	46 (13.2)	20 (11.7)	26 (14.4)
>45	1 (0.3)	0 (0.0)	1 (0.6)
Missing	3 (0.9)	0 (0.0)	3 (1.7)
Education, n (%)
Primary school	4 (1.1)	1 (0.6)	3 (1.7)	0.33
Skilled worker	3 (0.9)	0 (0.0)	3 (1.7)
Upper secondary education	15 (4.3)	5 (2.9)	10 (5.5)
Higher education
<3 years	27 (7.7)	12 (7.0)	15 (8.3)
3–4 years	113 (32.1)	57 (33.3)	56 (30.9)
≥5 years	190 (54.0)	96 (56.1)	94 (51.9)
Civil status, n (%)
In a relationship	347 (98.6)	167 (97.7)	180 (99.4)	0.33
Single	5 (1.4)	4 (2.3)	1 (0.6)
Ethnicity, n (%)
European	326 (93.1)	159 (93.5)	167 (92.3)	0.95
Other	24 (6.8)	11 (6.5)	13 (7.2)
Missing	2 (0.6)	1 (0.6)	1 (0.6)
Religious belief, n (%)
Christian	172 (49.3)	81 (47.6)	91 (50.3)	0.92
Muslim	8 (2.3)	4 (2.4)	4 (2.2)
Buddhist	0 (0.0)	0 (0.0)	0 (0.0)
Other religious belief	7 (2.0)	4 (2.4)	3 (1.7)
No religious belief	162 (46.4)	81 (47.6)	81 (44.8)
Missing	3 (0.9)	1 (0.6)	2 (1.1)
Gestational age, n (%)
<14 weeks	221 (63.1)	103 (60.9)	118 (65.2)	0.02
14–22 weeks	115 (32.9)	54 (32.0)	61 (33.7)
>22 weeks	14 (4.0)	12 (7.1)	2 (1.1)
Missing	2 (0.6)	2 (1.2)	0 (0.0)
cFTS (planned or completed), n (%)
Yes	352 (100.0)	171 (100.0)	181 (100.0)	0.59
No	0 (0.0)	0 (0.0)	0 (0.0)
ASA, n (%)
No	341 (96.9)	164 (95.9)	178 (98.3)	0.44
Yes	9 (2.6)	6 (3.5)	3 (1.7)
Missing	1 (0.3)	1 (0.6)	0 (0.0)

Abbreviations: ASA, acetylsalisylic acid; cFTS, combined first trimester screening.