Table 1 Maternal characteristics at first singleton, cephalic, term birth, by three time periods in Norway, The Medical Birth Registry of Norway, 1967–2020, N = 1 067 356
Time period | 1967–1982 | 1983–1998 | 1999–2020 | |||
|---|---|---|---|---|---|---|
N | % | N | % | N | % | |
Maternal age (years) | ||||||
< 20 | 66 043 | 20.1 | 27 505 | 9.0 | 17 639 | 4.1 |
20–24 | 163 585 | 49.8 | 114 526 | 37.5 | 97 448 | 22.5 |
25–29 | 76 728 | 23.3 | 113 394 | 37.2 | 168 214 | 38.8 |
30–34 | 17 184 | 5.2 | 39 245 | 12.9 | 110 421 | 25.5 |
35–39 | 4264 | 1.3 | 9198 | 3.0 | 33 832 | 7.8 |
> = 40 | 922 | 0.3 | 1210 | 0.4 | 5998 | 1.4 |
Maternal education | ||||||
Low (≤ 13 years) | 241 227 | 73.4 | 171 373 | 56.2 | 165 305 | 38.1 |
High (> 13 years) | 85 388 | 26.0 | 131 503 | 43.1 | 254 536 | 58.7 |
Missing | 2211 | 0.7 | 2202 | 0.7 | 13 711 | 3.2 |
Maternal country of birth | ||||||
Western women | 254 926 | 77.5 | 270 875 | 88.8 | 383 222 | 88.4 |
Non-western women | 1771 | 0.5 | 10 546 | 3.5 | 45 689 | 10.5 |
Missing | 72 029 | 21.9 | 23 657 | 7.8 | 4641 | 1.1 |
Pregnancy complications | ||||||
No pregnancy complications | 251 152 | 76.4 | 232 605 | 76.2 | 314 718 | 72.6 |
Any pregnancy complicationsa | 77 574 | 23.6 | 72 473 | 23.8 | 118 834 | 27.4 |
Total | 328 726 | 100.0 | 305 078 | 100.0 | 433 552 | 100.0 |