Table 3.
Caesarean section rates in each group of the Robson Ten Group Classification System by the study hospitals (n= 18 908)
| Robson Ten Group Classification System | All hospitals n (%)* |
Hospital 1 n (%)* |
Hospital 2 n (%)* |
Hospital 3 n (%)* |
P values† |
| 1 | 324/3564 (9.1) | 113/776 (14.6) | 62/745 (8.3) | 149/2043 (7.3) | <0.001 |
| 2 | 314/1366 (23.0) | 46/236 (19.5) | 51/185 (27.6) | 217/945 (23.0) | 0.148 |
| 3 | 239/7036 (3.4) | 57/2035 (2.8) | 73/1861 (3.9) | 109/3140 (3.5) | 0.148 |
| 4 | 236/2077 (11.4) | 23/342 (6.7) | 58/378 (15.3) | 155/1357 (11.4) | 0.001 |
| 5 | 1846/2510 (73.5) | 448/562 (79.7) | 283/377 (75.1) | 1115/1571 (71.0) | <0.001 |
| 6 | 206/216 (95.4) | 38/39 (97.4) | 23/24 (95.8) | 145/153 (94.8) | 0.774 |
| 7 | 312/355 (87.9) | 69/78 (88.5) | 79/82 (96.3) | 164/195 (84.1) | 0.017 |
| 8 | 501/732 (68.4) | 45/71 (63.4) | 132/180 (73.3) | 324/481 (67.4) | 0.213 |
| 9 | 8/8 (100) | 4/4 (100) | 2/2 (100) | 2/2 (100) | NA‡ |
| 10 | 351/1044 (33.6) | 41/140 (29.3) | 92/235 (39.1) | 218/669 (32.6) | 0.095 |
| Total | 4337/18 908 (22.9) | 884/4283 (20.6) | 855/4069 (21.0) | 2598/10 556 (24.6) |
*n=number of caesarean sections in the group/total number of births within the group.
†P value from Pearson χ2 test comparing caesarean section rates by hospital in each group.
‡Not applicable because the rate of caesarean section is a constant.