Maternal characteristics
|
Age, median (95% range), years
|
30.5 (19.7 to 39.8)
|
30.6 (19.6 to 39.1)
|
30.7 (20.1 to 39.3)
|
29.7 (19.0 to 39.6)
|
30.5 (19.8 to 39.0)
|
31.6 (21.5 to 39.8)
|
Height, mean (SD) (cm)
|
166.2 (7.4)
|
167.7 (7.4)
|
169.3 (7.3)
|
164.3 (7.1)
|
167.7 (7.3)
|
170.6 (7.2)
|
Weight, mean (SD) (kg)
|
71.8 (16.3)
|
68.7 (12.3)
|
70.4 (12.9)
|
64.8 (12.5)
|
68.8 (12.4)
|
76.0 (14.6)
|
Body mass index, mean (SD) (kg/m2)
|
26 (5.6)
|
24.4 (4.1)
|
24.6 (4.4)
|
24.0 (4.4)
|
24.5 (4.2)
|
26.2 (5.1)
|
Obesity
|
123 (20.3)
|
485 (10.0)
|
60 (9.9)
|
58 (9.6)
|
491 (10.1)
|
119 (19.7)
|
Education, no. higher (%)
|
217 (37)
|
2137 (45)
|
306 (52)
|
206 (34.8)
|
2141 (45.2)
|
313 (52.8)
|
Ethnicity, no. (%) Dutch/European
|
332 (54.9)
|
2899 (59.9)
|
395 (65.3)
|
283 (46.8)
|
2911 (60.1)
|
432 (71.4)
|
Parity, no. Nulliparous (%)
|
348 (57.5)
|
2792 (57.7)
|
330 (54.5)
|
434 (71.7)
|
2787 (57.6)
|
249 (41.2)
|
Smoking, no. (%)
|
None
|
440 (66.3)
|
3755 (73.9)
|
510 (79.6)
|
379 (65.2)
|
3466 (74.4)
|
462 (79.4)
|
Early pregnancy only
|
50 (7.5)
|
453 (8.9)
|
61 (9.5)
|
45 (7.7)
|
418 (9.0)
|
55 (9.5)
|
Continued
|
174 (26.2)
|
875 (17.2)
|
70 (10.9)
|
157 (27.0)
|
773 (16.6)
|
65 (11.2)
|
Birth characteristics
|
Males, no. (%)
|
295 (42.8)
|
2665 (50.5)
|
390 (59.2)
|
242 (40.0)
|
2435 (50.3)
|
362 (59.8)
|
Gestational age, median (95% range) weeks
|
39.7 (32.0 to 42.3)
|
40.3 (36.3 to 42.3)
|
39.9 (36.2 to 42.1)
|
40.3 (36.3 to 42.4)
|
40.3 (36.3 to 42.4)
|
39.9 (36.0 to 42.0)
|
Birth weight, mean (SD) grams
|
2622 (483)
|
3440 (425)
|
4176 (396)
|
2581 (421)
|
3442 (416)
|
4230 (399)
|
Preterm birth, no. (%)
|
74 (12.2)
|
184 (3.8)
|
21 (3.5)
|
66 (10.9)
|
187 (3.9)
|
26 (4.3)
|
Cesarean delivery, no. (%)
|
107 (18.9)
|
467 (10.5)
|
94 (17.1)
|
102 (18.2)
|
478 (10.8)
|
88 (16.0)
|
Assisted delivery, no. (%)
|
75 (13.3)
|
644 (14.5)
|
75 (13.6)
|
59 (15.9)
|
651 (14.7)
|
54 (9.9)
|
APGAR score below 7 at 5 min, no. (%)
|
16 (2.8)
|
40 (0.9)
|
4 (0.9)
|
12 (2.1)
|
44 (0.9)
|
5 (0.9)
|