Table 2.
Maternal, delivery and infant characteristics
| Characteristics | Hypoglycemia (n = 1 500) | No hypoglycemia (n = 99,560) | Significant difference yes/no* |
|---|---|---|---|
| Number (%) | Number (%) | ||
| Maternal age (years) | |||
| < 25 | 158 (11) | 9783 (10) | No |
| 25–29 | 343 (23) | 24,162 (24) | No |
| 30–34 | 542 (36) | 37,415 (38) | No |
| ≥ 35 | 457 (30) | 28,200 (28) | No |
| Parity (including present birth) | |||
| 1 | 917 (61) | 44,835 (45) | Yes |
| 2 | 350 (23) | 37,597 (38) | Yes |
| ≥ 3 | 233 (16) | 17,128 (17) | No |
| Maternal BMI (kg/m2) | |||
| < 18.5 | 40 (3) | 2788 (3) | No |
| 18.5–24.9 | 841 (56) | 64 446 (67) | Yes |
| 25–29.9 | 369 (25) | 20,504 (21) | Yes |
| ≥ 30 | 194 (13) | 7933 (8) | Yes |
| Missing | 3945 | ||
| Daily smoking in beginning of pregnancy | |||
| Non-smoker | 1405 (94) | 95,142 (96) | Yes |
| Smoker | 93 (6) | 4324 (4) | Yes |
| Missing | 96 | ||
| Mode of delivery | |||
| Vaginal non-instrumental | 767 (51) | 73,656 (74) | Yes |
| Vaginal instrumental | 148 (10) | 8327 (8) | Yes |
| Planned cesarean section | 283 (19) | 9375 (9) | Yes |
| Emergency cesarean section | 302 (20) | 8202 (8) | Yes |
| Infant sex | |||
| Male | 896 (60) | 49,730 (50) | Yes |
| Female | 604 (40) | 49,830 (50) | Yes |
| Gestational week | |||
| 34 | 6 (0.4) | 22 (0.02) | Yes |
| 35 | 19 (1) | 135 (0.1) | Yes |
| 36 | 103 (7) | 1212 (1) | Yes |
| 37 | 192 (13) | 4224 (4) | Yes |
| 38 | 299 (20) | 14,437 (15) | Yes |
| 39 | 275 (18) | 25,249 (25) | Yes |
| 40 | 317 (21) | 29,222 (29) | Yes |
| 41 | 190 (13) | 18,859 (19) | Yes |
| ≥ 42 | 92 (6) | 6,155 (6) | Yes |
| Missing | 52 | ||
| Birth weight for gestational age | |||
| Small for gestational age (SGA) | 289 (19) | 5386 (5) | Yes |
| Appropriate for gestational age (AGA) | 933 (62) | 83,728 (84) | Yes |
| Large for gestational age (LGA) | 278 (19) | 10,385 (10) | Yes |
| Missing | 61 | ||
| Apgar score at 5 min | |||
| 7 or more | 1475 (98) | 99,168 (100) | Yes |
| > 7 | 23 (2) | 204 (0.2) | Yes |
| Missing | 190 | ||
| Birth year | |||
| 2008 | 179 (12) | 9643 (10) | Yes |
| 2009 | 295 (20) | 21,839 (22) | Yes |
| 2010 | 356 (24) | 22,985 (23) | No |
| 2011 | 303 (20) | 22,503 (23) | Yes |
| 2012 | 367 (24) | 22,590 (23) | No |
Congenital malformations, inborn errors of metabolism, and maternal diabetes are excluded in the Stockholm-Gotland cohort 2008–2012
*Variable significantly different between hypoglycemia and non-hypoglycemia group in chi2-test (P < 0.05)