| All (Number) | % | Combined prenatal screening test at week 11–14 | |||
---|---|---|---|---|---|---|
% | OR | 95%CI | p-value | |||
Total | 1111 | Â | 78.3 (862/1101) | Â | ||
Parity at study entry | ||||||
 Primipara | 439 | 39.5 (439/1110) | 82.3 (359/436) | 1 | Ref. |  |
 Multipara | 671 | 60.5 (671/1110) | 75.6 (503/665) | 0.67 | 0.49–0.90 | .009 |
Education | ||||||
 Primary (10 years) | 123 | 11.1 (123/1109) | 73.0 (89/122) | 0.53 | 0.34–0.83 | .006 |
 Secondary (4 years) | 291 | 26.2 (291/1109) | 67.9 (195/287) | 0.42 | 0.30–0.58 | .009 |
 Higher (total > 14 years) | 695 | 62.7 (695/1109) | 83.5 (577/691) | 1 | Ref. |  |
Age (years) | ||||||
 18–24 | 186 | 16.7 (186/1111) | 75.0 (138/184) | 0.39 | 0.23–0.69 | .001 |
 25–34 | 733 | 66.0 (733/1111) | 76.5 (557/728) | 0.43 | 0.27–0.69 | <.001 |
  > 35 | 192 | 17.3 (192/1111) | 88.4 (168/190) | 1 | Ref. |  |
Region | ||||||
 Urban | 763 | 68.7 (763/1110) | 86.5 (656/758) | 1 | Ref. |  |
 Rural | 347 | 31.3 (347/1110) | 60.1 (206/343) | 0.23 | 0.17–0.32 | <.001 |
I have tried to become pregnant for more than one year | ||||||
 Yes | 147 | 13.3 (147/1106) | 83.0 (122/147) | 1 | Ref. |  |
 No | 959 | 86.7 (959/1106) | 77.6 (737/950 | 0.71 | 0.45–1.12 | .140 |
Assisted pregnancy such as in vitro fertilization or artificial insemination | ||||||
 Yes | 67 | 6.1 (67/1106) | 85.1 (57/67) | 1 | Ref. |  |
 No | 1039 | 93.9 (1039/1106) | 77.9 (802/1030) | 0.62 | 0.31–1.23 | .168 |
Type of health care provider as first contact in pregnancy | ||||||
 Midwife | 320 | 29.1 (320/1110) | 71.3 (228/320) | 1 | Ref. |  |
 General practitioner | 129 | 11.7 (129/1110) | 72.9 (94/129) | 1.08 | 0.69–1.71 | .730 |
 Gynaecologist | 609 | 55.4 (609/1110) | 83.3 (507/609) | 2.01 | 1.45–2.77 | <.001 |
 Others | 42 | 3.8 (42/1110) | 76.2 (32/429) | 1.29 | 0.61–2.73 | .504 |