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Table 3 Perception of information given and odds (OR) for decision making regarding early prenatal NT* screening or the combined test** for foetal anomalies at week 11–14. Percentages, absolute figures within brackets, odds ratios (OR) and 95% confidence intervals (95% CI)

From: Use of pregnancy ultrasound before the 19th week scan: an analytical study based on the Icelandic Childbirth and Health Cohort

  Number % Combined prenatal screening test at week 11–14
% OR 95% CI p-value
Information about availability of first trimester ultrasound scan
 Enough or too much 906 84.2 (906/1076) 79.2 (718/906) 1 Ref.  
 Not enough 52 4.8 (52/1076) 75.0 (39/52) 0.79 0.41–1.50 .465
 No information 118 11.0 (118/1076) 72.0 (85/118) 0.67 0.44–1.04 .075
Information about availability of early prenatal screening in week 11–14
 Enough or too much 938 86.8 (938/1081) 79.6 (747/938) 1 Ref.  
 Not enough 69 6.4 (69/1081) 66.7 (46/69) 0.51 0.30–0.87 .012
 None 74 6.8 (74/1081) 73.0 (54/74) 0.69 0.40–1.18 .176
Information about the potential risk of early prenatal screening in week 11–14
 Enough or too much 521 48.3 (521/1078) 76.6 (399/521) 1 Ref.  
 Not enough 145 13.5 (145/1078) 80.7 (117/145) 1.28 0.81–2.02 .296
 No information 412 38.2 (412/1078) 80.3 (331/412) 1.25 0.91–1.72 .168
Information about the potential risk associated with foetal prenatal diagnosis
 Enough or too much 509 47.2 (509/1079) 78.0 (397/509) 1 Ref.  
 Not enough 153 14.2 (153/1079) 81.7 (125/153) 1.26 0.80–2.00 .326
 No information 417 38.6 (417/1079) 78.2 (326/417) 1.01 0.74–1.38 .947
Information about upcoming/routine ultrasound scan in week 19–20
 Enough or too much 815 75.5 (815/1080) 75.7 (617/815) 1 Ref.  
 Not enough 152 14.1 (152/1080) 85.5 (130/152) 1.90 1.17–3.06 .009
 No information 113 10.5 (113/1080) 91.2 (103/113) 3.31 1.69–6.45 <.001
  1. *NT Foetal nuchal translucency
  2. **ß-hcg and PAPP-A measured in plasma and NT measurements by ultrasound