OU | Non-OU | |||||
---|---|---|---|---|---|---|
Events/births | Weighted* | Events/births | Weighted* | |||
Age (years) | n/N | % | (95% CI) | n/N | % | (95% CI) |
Maternal composite | ||||||
16–19 | 35/177 | 20.2 | (14.1 to 28.0) | 20/338 | 6.6 | (4.1 to 10.6) |
20–24 | 242/1506 | 16.2 | (13.8 to 19.0) | 146/3486 | 4.6 | (3.6 to 5.8) |
25–29 | 468/2504 | 18.9 | (16.9 to 20.9) | 297/6989 | 4.8 | (4.1 to 5.7) |
30–34 | 492/2548 | 19.2 | (16.8 to 21.8) | 418/8440 | 5.4 | (4.7 to 6.2) |
35–39 | 344/1575 | 21.9 | (19.4 to 24.7) | 273/5737 | 5.6 | (4.8 to 6.6) |
40+ | 82/340 | 24.1 | (20.7 to 28.0) | 65/975 | 7.4 | (5.6 to 9.7) |
Total | 1663/8650 | 19.3 | (17.6 to 21.1) | 1219/25 965 | 5.3 | (4.7 to 5.9) |
Augmentation | ||||||
16–19 | 19/178 | 10.5 | (5.9 to 17.9) | 11/340 | 3.8 | (2.0 to 7.1) |
20–24 | 144/1516 | 9.4 | (7.5 to 11.8) | 62/3520 | 2.0 | (1.4 to 2.7) |
25–29 | 247/2529 | 9.9 | (8.2 to 12.0) | 109/7077 | 1.8 | (1.4 to 2.3) |
30–34 | 255/2572 | 9.7 | (8.0 to 11.7) | 132/8535 | 1.6 | (1.3 to 2.0) |
35–39 | 156/1592 | 9.8 | (8.2 to 11.6) | 89/5796 | 1.8 | (1.3 to 2.5) |
40+ | 42/345 | 12.2 | (9.5 to 15.5) | 18/985 | 1.8 | (1.1 to 3.2) |
Total | 863/8732 | 9.8 | (8.5 to 11.4) | 421/26 253 | 1.8 | (1.5 to 2.1) |
Instrumental delivery | ||||||
16–19 | 12/179 | 7.5 | (3.6 to 14.9) | 7/340 | 3.1 | (1.3 to 7.1) |
20–24 | 55/1530 | 3.6 | (2.7 to 4.9) | 38/3520 | 1.4 | (1.0 to 2.0) |
25–29 | 139/2557 | 5.5 | (4.6 to 6.5) | 102/7092 | 1.8 | (1.4 to 2.3) |
30–34 | 159/2594 | 6.1 | (5.0 to 7.5) | 124/8544 | 1.6 | (1.2 to 2.0) |
35–39 | 102/1600 | 6.6 | (5.0 to 8.6) | 82/5802 | 1.8 | (1.4 to 2.4) |
40+ | 30/347 | 8.8 | (5.5 to 13.8) | 17/987 | 2.5 | (1.3 to 4.7) |
Total | 497/8807 | 5.7 | (4.9 to 6.7) | 370/26 285 | 1.7 | (1.4 to 2.1) |
Intrapartum caesarean section | ||||||
16–19 | 6/179 | 3.4 | (1.4 to 7.7) | 4/340 | 0.9 | (0.3 to 2.5) |
20–24 | 62/1530 | 4.1 | (2.6 to 6.3) | 21/3520 | 0.6 | (0.3 to 1.1) |
25–29 | 121/2557 | 4.8 | (3.8 to 6.1) | 48/7092 | 0.7 | (0.5 to 0.9) |
30–34 | 134/2594 | 5.1 | (4.0 to 6.5) | 70/8544 | 0.9 | (0.6 to 1.2) |
35–39 | 110/1600 | 6.8 | (5.1 to 9.1) | 53/5802 | 1.1 | (0.8 to 1.5) |
40+ | 16/347 | 4.8 | (3.1 to 7.4) | 15/987 | 1.5 | (0.8 to 2.7) |
Total | 449/8807 | 5.1 | (4.2 to 6.3) | 211/26 285 | 0.8 | (0.7 to 1.1) |
*Percentages are weighted to take account of differences in the probability of a woman being selected for inclusion in the study arising from differences in each unit/trust's period of participation and the stratum-specific probabilities of selection of OUs.
OU, obstetric unit.