Table 1 Background characteristics of the study population and univariate logistic regression analyses of the uptake of the combined test (CT) and the fetal anomaly scan (FAS) among pregnant women participating in the DELIVER study

Total

5,216 (100)

1,195 (23)

4,679 (90)

Religion

None

3,042 (59)

852 (28)

1

2,909 (95)

1

Islam

247 (5)

50 (20)

0.66 (0.48-0.90)^c

198 (80)

0.20 (0.14-0.28)^d

Protestantism

1,210 (23)

74 (6)

0.17 (0.13-0.22)^d

913 (76)

0.15 (0.12-0.19)^d

Catholicism

547 (10)

166 (30)

1.13 (0.92-1.37)

514 (94)

0.76 (0.52-1.12)

Other ^e

37 (1)

17 (46)

2.19 (1.14-4.21)^c

35 (95)

0.85 (0.20-3.59)

Would not say

90 (2)

24 (27)

0.94 (0.58-1.51)

78 (87)

0.32 (0.17-0.60)^d

Age (years)

≤ 30

2,507 (48)

326 (13)

1

2,235 (89)

1

31-35

1,872 (36)

463 (25)

2.20 (1.88-2.57)^d

1,700 (91)

1.20 (0.98-1.47)

≥ 36

833 (16)

406 (49)

6.36 (5.32-7.61)^d

741 (89)

0.98 (0.76-1.26)

Level of education

Low

697 (13)

145 (21)

1

575 (82)

1

Medium

1,867 (36)

329 (18)

0.81 (0.66-1.01)

1,658 (89)

1.68 (1.32-2.15)^d

High

2,627 (51)

713 (27)

1.42 (1.16-1.74)^c

2,421 (92)

2.49 (1.96-3.18)^d

Ethnic background

Dutch

4,397 (84)

956 (22)

1

3,948 (90)

1

Non-Dutch

808 (16)

237 (29)

1.49 (1.26-1.77)^d

720 (89)

0.93 (0.73-1.19)

Income

None to average

1,752 (41)

291 (17)

1

1,493 (85)

1

Above average

2,507 (59)

675 (27)

1.85 (1.59-2.16)^d

2,338 (93)

2.40 (1.96-2.95)^d

Region

West

1,511 (29)

461 (31)

1

1,360 (90)

1

East

1,622 (31)

208 (13)

0.34 (0.28-0.40)^d

1,371 (85)

0.61 (0.49-0.75)^d

South

739 (14)

226 (31)

1.00 (0.83-1.22)

697 (94)

1.84 (1.19-2.63)^d

North

1,344 (26)

300 (22)

0.65 (0.55-0.78)^d

1,251 (93)

1.50 (1.14-1.96)d^c

Parity

Nulliparous

2,472 (47)

602 (24)

1

2,298 (93)

1

Multiparous

2,739 (53)

592 (22)

0.86 (0.75-0.96)^c

2,376 (87)

0.50 (0.41-0.60)^d

Consanguinity

No

5,053 (99)

1,154 (23)

1

4,545 (90)

1

Yes

58 (1)

11 (19)

0.79 (0.41-1.53)

42 (72)

0.29 (0.16-0.53)^d