| Variables | Frequency (%) |
|---|---|
| Age (mean±SD) | 29.1±5.3 |
| Place of residence | |
| Ho Chi Minh City | 164 (42.7) |
| Other | 220 (57.3) |
| Occupation | |
| Office staff | 126 (32.8) |
| Housewife | 106 (27.6) |
| Factory worker | 87 (22.7) |
| Vendor | 51 (13.3) |
| Other | 14 (3.6) |
| BMI (kg/m2) | |
| 17–18.49 | 2 (0.5) |
| 18.5–24.9 | 139 (36.2) |
| 25–29.9 | 194 (50.5) |
| 30–34.9 | 47 (12.3) |
| 35–39.9 | 2 (0.5) |
| Medical history | 53 (13.8) |
| Surgical history | 32 (8.3) |
| Parity | |
| Primiparity | 190 (49.5) |
| Multiparity | 194 (50.5) |
| Delivery history | |
| Never | 190 (49.5) |
| Vaginal delivery history | 184 (47.9) |
| C-section history | 7 (1.8) |
| Vaginal birth after caesarean | 3 (0.8) |
| History of episiotomy | 177 (46.1) |