T1DM, N= 4092 Reference group, N=905 565
  Primipara Multipara Primipara Multipara
Maternal characteristics  
Age, years* 28 (25-32) 32 (28-35) 28 (25-31) 31 (28-35)
Nordic 1746 (94.3) 2028(90.5) 340 758 (84.7) 415 794 (82.6)
Living with partner 1563 (84.4) 1968 (87.8) 350 203 (87.0) 455 007 (90.4)
Smoking in early pregnancy 315 (17.0) 341 (15.2) 76 297 (19.0) 70 023 (13.9)
Body mass index* 24.7 (22.7-27.7) 25.5 (23.2-29.3) 23.1 (21.2-25.8) 23.9 (21.7-26.8)
Height, cm* 167 (162-171) 166 (162-170) 167 (162-171) 167 (162-170)
Infant characteristics        
Male 926 (50.0) 1162 (51.9) 207 225 (51.5) 258 815 (51.4)
Gestational age, weeks* 38 (37-39) 38 (37-39) 40 (39-41) 40 (39-40)
Preterm birth (<37 weeks) 450 (24.3) 466 (20.8) 24 653 (6.1) 20 087 (4.0)
Birth weight* 3665
(3185-4122)
3900
(3450-4340)
3475
(3145-3810)
3640
(3305-3980)
Birth length* 50 (49-52) 51 (49-52) 50 (49-52) 51 (49-52)
Mode of delivery        
Cesarean section 1025 (55.4) 1063 (47.5) 70 610 (17.6) 68 311 (13.6)
Ventouse  /forceps 325 (17.6) 108 (4.8) 54 396 (13.5) 14 106 (2.8)
*Comparisons were made using the Mann Whitney U test. *Numbers are medians and interquartile ranges.
Table 1: Maternal and infant characteristics and mode of delivery, stratified by maternal diabetes.