Descriptive characteristics of the study population according to maternal cancer diagnosis status
| Characteristic | Total | Maternal cancer diagnosis | No maternal cancer diagnosis | |||
| (n=5 523 365) | (n=95 672) | (n=5 427 693) | ||||
| n (%) | n (%) | n (%) | ||||
| Birth weight | ||||||
| LBW <2500 g | 240 908 | (4) | 5098 | (5) | 235 810 | (4) |
| NBW 2500–3999 g | 4 134 906 | (75) | 70 773 | (74) | 4 064 133 | (75) |
| HBW ≥4000 g | 864 065 | (16) | 15 641 | (16) | 848 424 | (16) |
| Missing | 283 456 | (5) | 4160 | (4) | 279 326 | (5) |
| Gestational age | ||||||
| Preterm <37 weeks | 348 933 | (6) | 7217 | (8) | 341 716 | (6) |
| Normal term 37–40 weeks | 3 725 984 | (67) | 63 770 | (67) | 3 662 214 | (67) |
| Post-term >40 weeks | 1 384 607 | (25) | 23 541 | (25) | 1 361 066 | (25) |
| Missing | 63 841 | (1) | 1144 | (1) | 62 697 | (1) |
| Size for gestational age | ||||||
| SGA | 185 054 | (3) | 3389 | (4) | 181 665 | (3) |
| AGA | 4 835 364 | (88) | 83 949 | (88) | 4 751 415 | (88) |
| LGA | 175 319 | (3) | 3402 | (4) | 171 917 | (3) |
| Missing | 327 628 | (6) | 4932 | (5) | 322 696 | (6) |
| Apgar score at 5 min | ||||||
| 0–7 | 99 233 | (2) | 1821 | (2) | 97 412 | (2) |
| 8–10 | 4 967 517 | (90) | 86 560 | (90) | 4 880 957 | (90) |
| Missing | 456 615 | (8) | 7291 | (8) | 449 324 | (8) |
| Delivery by caesarean section | ||||||
| Yes | 597 607 | (11) | 11 707 | (12) | 585 900 | (11) |
| No | 4 395 081 | (80) | 75 966 | (79) | 4 319 155 | (80) |
| Missing | 530 677 | (10) | 7999 | (8) | 522 678 | (10) |
| Sex | ||||||
| Male | 2 836 613 | (51) | 49 246 | (51) | 2 787 367 | (51) |
| Female | 2 686 733 | (49) | 46 425 | (49) | 2 640 308 | (49) |
| Missing | 19 | (<1) | 1 | (<1) | 18 | (<1) |
| Maternal age | ||||||
| <27 | 2 037 737 | (37) | 21 094 | (22) | 2 016 635 | (37) |
| 27–30 | 1 627 373 | (29) | 26 094 | (27) | 1 601 279 | (30) |
| ≥31 | 1 857 805 | (34) | 48 473 | (51) | 1 809 332 | (33) |
| Missing | 450 | (<1) | 3 | (<1) | 447 | (<1) |
| Maternal years of education | ||||||
| Low, ≤9 years | 1 107 453 | (20) | 17 652 | (18) | 1 089 801 | (20) |
| Middle, 10–14 years | 2 886 401 | (52) | 48 547 | (51) | 2 837 854 | (52) |
| High, ≥15 years | 883 611 | (16) | 18 193 | (19) | 865 418 | (16) |
| Missing | 645 900 | (12) | 11 280 | (12) | 634 620 | (12) |
| Parity | ||||||
| 1 | 2 422 259 | (44) | 35 867 | (37) | 2 386 392 | (44) |
| 2 | 2 022 094 | (37) | 36 482 | (38) | 1 985 612 | (37) |
| ≥3 | 1 072 865 | (19) | 23 209 | (24) | 1 049 656 | (19) |
| Missing | 6147 | (<1) | 114 | (<1) | 6033 | (<1) |
| Multiplicity | ||||||
| Singleton | 5 242 759 | (95) | 91 432 | (96) | 5 151 327 | (95) |
| Twin/triplet/quadruplet | 145 923 | (3) | 2755 | (3) | 143 168 | (3) |
| Missing | 134 683 | (2) | 1485 | (2) | 133 198 | (2) |
| Birth year group | ||||||
| <1980 | 897 032 | (16) | 15 843 | (17) | 881 189 | (16) |
| 1980–1989 | 1 595 922 | (29) | 32 704 | (34) | 1 563 218 | (29) |
| 1990–1999 | 1 760 215 | (32) | 35 188 | (37) | 1 725 027 | (32) |
| ≥2000 | 1 270 196 | (23) | 11 937 | (12) | 1 258 259 | (23) |
| Country | ||||||
| Denmark | 2 123 229 | (38) | 37 360 | (39) | 2 085 869 | (38) |
| Sweden | 3 400 136 | (62) | 58 312 | (61) | 3 341 824 | (62) |
AGA, appropriate for gestational age; HBW, high birth weight; LBW, low birth weight; LGA, large for gestational age; NBW, normal birth weight; SGA, small for gestational age.