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Table 1 Maternal and pregnancy characteristics of participants and non-participants of the malformations scan (gestational week 18–21)

From: Reasons for non-participation in malformation scans in Denmark: a cohort study

  Non-participants Participants
Characteristics N (%)a N (%)a
Total 153 (2.4) 6227 (97.6)
Age (years) 27.8 (14–41) 29.5 (16–52)c
Smoking status
 Yes 25 (16.3) 325 (10.0)c
 No 125 (81.7) 5513 (88.5)
 Unknown 3 (2.0) 89 (1.4)
Parity
 Nulliparous 82 (53.6) 2621 (42.1)
 Multiparous 70 (45.8) 3435 (55.2)c
 Unknown 1 (0.7) 171 (2.8)
BMI
  < 18.5 10 (6.5) 258 (4.1)
 18.5–24.99 85 (55.6) 3522 (56.6)
 25.00–29.99 26 (17.0) 1404 (22.6)
  ≥ 30.00 24 (15.7) 895 (14.4)
 Unknown 8 (5.2) 148 (2.4)
Country of origin
 Denmark 58 (37.9) N/Ab
 Other 93 (60.8) N/Ab
 Unknown 2 (1.3) N/Ab
  1. BMI body mass index; adata are given as mean (range) or N (%); bdata not available; cP <  0.05