Table 1 Maternal and newborn characteristics by maternal body mass index in a cohort of 24,222 infants from the Copenhagen Baby Heart Study, Denmark, 2016–2018
Number (%) | |||||
|---|---|---|---|---|---|
Maternal body mass index | Underweight BMI < 18.5 N = 945 | Normal BMI 18.5–24.9 N = 16808 | Preobesity BMI 25.0–29.9 N = 4477 | Obesity class I BMI 30.0–34.9 N = 1367 | Obesity class II + III BMI ≥ 35 N = 625 |
Maternal Characteristics | |||||
Age at delivery (years) | |||||
< 25 | 71 (7.5) | 711 (4.2) | 216 (4.8) | 78 (5.7) | 41 (6.6) |
25–29 | 296 (31.3) | 4740 (28.2) | 1261 (28.2) | 377 (27.6) | 188 (30.1) |
30–34 | 388 (41.1) | 6961 (41.4) | 1721(38.4) | 506 (37.0) | 222 (35.5) |
35–39 | 160 (16.9) | 3520 (20.9) | 982 (21.9) | 323 (23.6) | 141 (22.6) |
≥ 40 | 30 (3.2) | 876 (5.2) | 297 (6.6) | 83 (6.1) | 33 (5.3) |
First-trimester smoking | |||||
Yes | 40 (4.2) | 405 (2.4) | 157 (3.5) | 92 (6.7) | 45 (7.2) |
No | 870 (92.1) | 15985 (95.1) | 4185 (93.5) | 1254 (91.7) | 555 (88.8) |
Missing | 35 (3.7) | 418 (2.5) | 135 (3.0) | 21 (1.5) | 25 (4.0) |
Newborn Characteristics | |||||
Sex | |||||
Male | 500 (52.9) | 8620 (51.3) | 2329 (52.0) | 750 (54.9) | 308 (49.3) |
Female | 445 (47.1) | 8188 (48.7) | 2148 (48.0) | 617 (45.1) | 317 (50.7) |
Gestational age at birth (weeks) | |||||
37 | 61 (6.5) | 915 (5.4) | 281 (6.3) | 110 (8.0) | 74 (11.8) |
38 | 148 (15.7) | 2136 (12.7) | 648 (14.5) | 238 (17.4) | 132 (21.1) |
39 | 234 (24.8) | 3681 (21.9) | 925 (20.7) | 298 (21.8) | 118 (18.9) |
40 | 296 (31.3) | 5275 (31.4) | 1260 (28.1) | 367 (26.8) | 135 (21.6) |
≥ 41 | 206 (21.8) | 4801 (28.6) | 1363 (30.4) | 354 (25.9) | 166 (26.6) |
Birthweight (g) | |||||
< 2500 | * | 264 (1.6) | 46 (1.0) | * | 10 (1.6) |
2500–2999 | 172 (18.2) | 1934 (11.5) | 402 (9.0) | 126 (9.2) | 57 (9.1) |
3000–3499 | 380 (40.2) | 6014 (35.8) | 1397 (31.2) | 414 (30.3) | 166 (26.6) |
3500–3999 | 301 (31.9) | 6184 (36.8) | 1676 (37.4) | 482 (35.3) | 237 (37.9) |
≥ 4000 | 66 (7.0) | 2389 (14.2) | 949 (21.2) | 313 (22.9) | 155 (24.8) |
Missing | * | 23 (0.1) | 7 (0.2) | * | 0 (0.0) |
Birth length (cm) | |||||
< 50 | 167 (17.7) | 2177 (13.0) | 486 (10.9) | * | * |
50–54.9 | 717 (75.9) | 13031 (77.5) | 3436 (76.7) | 1046 (76.5) | 468 (74.9) |
≥ 55 | 54 (5.7) | 1531 (9.1) | 533 (11.9) | 143 (10.5) | 70 (11.2) |
Missing | 7 (0.7) | 69 (0.4) | 22 (0.5) | * | * |
Congenital heart defecta | |||||
Yes | 66 (7.0) | 1126 (6.7) | 339 (7.6) | 116 (8.5) | 45 (7.2) |
No | 879 (93.0) | 15682 (93.3) | 4138 (92.4) | 1251 (91.5) | 580 (92.8) |