| Aetiology | Level | Trimester of pregnancy | Chi-square | p-value | ||
| 1st | 2nd | 3rd | ||||
| Ectopic pregnancy | NO | 87 (39.7) | 94 (96.9) | 94 (96.9) | 104.96 | 0 |
| YES | 132 (60.3) | 3 (3.1) | 0 (0.0) | |||
| Miscarriage | NO | 146 (66.7) | 41 (42.3) | 19 (100.0) | 29.51 | 0 |
| YES | 73 (33.3) | 56 (57.6) | 0 (0.0) | |||
| UTI | NO | 212 (96.8) | 81 (83.5) | 11 (57.9) | 40.04 | 0 |
| YES | 7 (3.2) | 16 (16.5) | 8 (42.1) | |||
| Uterine Myoma | NO | 218 (99.5) | 89 (91.8) | 18 (94.7) | 14.45 | 0.001 |
| YES | 1 (0.5) | 8 (8.2) | 1 (5.3) | |||
| Abruptio placentae | NO | 219 (100.0) | 96 (99.0) | 14 (77.7) | 96.28 | 0 |
| YES | 0 (0.0) | 1 (1.0) | 5 (26.3) | |||
| Uterine rupture | NO | 219 (100.0) | 97 (100.0) | 16 (84.2) | 50.34 | 0 |
| YES | 0 (0.0) | 0 (0.0) | 3 (15.8) | |||
| PID | NO | 215 (98.2) | 96 (99.0) | 18 (94.7) | 1.61 | 0.44 |
| YES | 4 (1.8) | 1 (1.0) | 1 (5.3) | |||
| Appendicitis | NO | 219 (100.0) | 93 (95.9) | 19 (100.0) | 9.93 | 0.007 |
| YES | 0 (0.0) | 4 (4.1) | 0 (0.0) | |||