Variables
No EA n = 195 383 EA n = 52 153 Total n = 247 536
Age (years) 28.1 ± 5.2 28.5 ± 5.4 28.2 ± 5.3
BMI (kg/m2) 22.8 ± 4.1 23.2 ± 4.3 22.9 ± 4.1
Gestation week 39.4 ± 1.1 39.6 ± 1.1 39.4 ± 1.1
Birth weight (grams) 3339 ± 412 3394 ± 412 3351 ± 412
Length of stay (days) 3 [3 to 4] 4 [3 to 4] 3 [3 to 4]
Hospital classification
<500 deliveries per year 79 883 (40.9%) 21 688 (41.6%) 101 571 (41.0%)
>500 deliveries per year 51 800 (26.5%) 12 222 (23.4%) 64 022 (25.8%)
Perinatalcentre 1 21 823 (11.2%) 3871 (7.4%) 25 694 (10.4%)
Perinatalcentre 2 42 023 (21.5%) 14 411 (27.6%) 56 434 (22.8%)
Episiotomy 53 335 (27.3%) 17 541 (33.6%) 70 876 (28.6)
median 1195 (0.6%) 438 (0.8%) 1633 (0.7%)
mediolateral 52 134 (26.7%) 17 100 (32.8%) 69 234 (27.9%)