Mothers ≤ 39 n = 71,472 | Mothers 40–44 n = 35,329 | Mothers ≥ 45 n = 2229 | P-value1 | P-value2 | P-value3 | P-value4 | ||||
---|---|---|---|---|---|---|---|---|---|---|
min-max (mean/sd) | min-max (mean/sd) | min-max (mean/sd) | ||||||||
Maternal age, min-max (mean/sd) | 14–39 (31.45/4.54) | 40–44 (41.41/1.19) | 45–55 (45.92/1.39) | < 0.001 | < 0.001 | < 0.001 | < 0.001 | |||
n | % | n | % | n | % | P-value1 | P-value2 | P-value3 | P-value4 | |
Civil status | < 0.001 | < 0.001 | < 0.001 | < 0.001 | ||||||
Married/ cohabiting | 64,059 | 89.6 | 30,106 | 85.0 | 1802 | 80.8 | ||||
Single status at registration | 7413 | 10.4 | 5323 | 15.0 | 427 | 19.2 | ||||
Parity | 0.001 | < 0.001 | 0.664 | 0.126 | ||||||
Primiparous | 15,660 | 21.9 | 7417 | 20.9 | 497 | 22.3 | ||||
Multiparous | 55,812 | 78.1 | 28,012 | 79.1 | 1732 | 77.7 | ||||
Worked during pregnancy | < 0.001 | < 0.001 | < 0.001 | 0.004 | ||||||
Unemployed/ student/ other | 17,103 | 27.4 | 6418 | 20.8 | 454 | 23.9 | ||||
Full time | 27,543 | 44.2 | 16,219 | 52.5 | 964 | 50.8 | ||||
Part time | 17,717 | 28.4 | 8267 | 26.8 | 478 | 25.2 | ||||
Tobacco use during pregnancy | < 0.001 | < 0.001 | 0.004 | 0.383 | ||||||
Yes | 8329 | 12.3 | 3588 | 10.8 | 210 | 10.2 | ||||
Mother’s BMI (registration) | < 0.001 | < 0.001 | < 0.001 | 0.003 | ||||||
Normal | 35,306 | 56.2 | 16,156 | 53.2 | 905 | 48.9 | ||||
Underweight | 1165 | 1.9 | 291 | 1.0 | 21 | 1.1 | ||||
Overweight | 17,117 | 27.3 | 9338 | 30.8 | 611 | 33.0 | ||||
Obese | 9185 | 14.6 | 4566 | 15.0 | 314 | 17.0 | ||||
Chronic illnessb | 0.725 | 0.890 | 0.440 | 0.422 | ||||||
Yes | 15,035 | 21.0 | 7440 | 21.0 | 484 | 21.7 | ||||
ART | < 0.001 | < 0.001 | < 0.001 | < 0.001 | ||||||
Yes | 1894 | 2.6 | 2813 | 7.9 | 249 | 11.2 |