Table 2.
Relationship between prolonged menstrual bleeding, age, number of CS, and ultrasound parameters of CSD.
| 8-10 days | 11-14 days | ≥15 days | P | |
|---|---|---|---|---|
| N = 56 | N = 78 | N = 96 | ||
| Age (years) (mean ± SD) | 32.3 ± 3.4 | 33.1 ± 3.9 | 33.2 ± 3.9 | 0.303 |
| Number of CS | 0.008 | |||
| 1 | 43 | 65 | 59 | |
| 2 | 13 | 13 | 34 | |
| 3 | 0 | 0 | 3 | |
| Uterine position | 0.108 | |||
| Retroflexion | 35 | 50 | 47 | |
| Anteflexion | 21 | 24 | 45 | |
| Neutral position | 0 | 4 | 4 | |
| W | 5 (4-7) | 7 (6-9)# | 8 (6-11)#,∗ | <0.001 |
| D | 5 (4-7) | 7 (5-8)# | 8.5 (6-10)#,∗ | <0.001 |
| L | 9.3 ± 3.9 | 12.5 ± 4.1# | 16.6 ± 4.7#,∗ | <0.001 |
| RMT | 2.4 (2-3.42) | 2.4 (2-3) | 2.3 (1.7-2.92) | 0.177 |
| RMT/D | 0.50 (0.33-0.75) | 0.40 (0.27-0.57) | 0.28 (0.19-0.43)#∗ | <0.001 |
| RMT/(RMT + D) | 0.33 (0.25-0.43) | 0.29 (0.21-0.36) | 0.22 (0.16-0.30)#,∗ | <0.001 |
CS: cesarean section; CSD: cesarean section scar diverticulum; W: width of the niche; D: depth of the niche; L: length of the niche; RMT: residual myometrial thickness. #P < 0.05 vs. 8-10 days and ∗P < 0.05 vs. 11-14 days.