Perinatal data
|
Boys (n=3356)
|
Girls (n=3382)
|
OR (boys/girls) (95% CI)
|
Multiple birth | 21 (11–28) | 20 (12–29) | 1.06 (0.94 to 1.20) |
Birth weight (g)2-150 |
501–750 | 20 (11–24) | 21 (17–25) | |
751–1000 | 24 (21–26) | 23 (19–27) | |
1001–1250 | 27 (22–30) | 25 (20–28) | |
1251–1500 | 29 (22–39) | 31 (28–37) | |
Gestational age (weeks) |
19–23 | 8 (4–10) | 6 (3–8) | 1.28 (1.06 to 1.55) |
24–27 | 39 (28–48) | 35 (32–40) | 1.20 (1.08 to 1.32) |
28–31 | 42 (37–50) | 45 (39–48) | 0.91 (0.83 to 1.00) |
32–402-151
| 10 (6–16) | 14 (11–20) | 0.71 (0.62 to 0.83) |
Mode of delivery2-152 |
Vaginal vertex | 44 (33–50) | 42 (28–49) | 1.06 (0.96 to 1.17) |
Vaginal breech | 7 (4–13) | 7 (5–11) | |
Caesarean section | 49 (40–61) | 51 (45–65) | |
Delivery room resuscitation |
Endotracheal intubation | 67 (52–78) | 63 (47–77) | 1.16 (1.05 to 1.29) |
Resuscitation medication | 9 (2–19) | 6 (3–22) | 1.40 (1.17 to 1.68) |
Apgar ⩽3 at 1 min | 38 (29–51) | 34 (25–41) | 1.21 (1.09 to 1.34) |
Apgar ⩽3 at 5 min | 13 (8–21) | 10 (5–16) | 1.35 (1.16 to 1.58) |