Table 1. Baseline characteristics of patients.
| Variable | Subjects (n = 1152) |
|---|---|
| Age (years), n (%) | |
| ≤30 | 370 (32.1) |
| 31–40 | 450 (39.1) |
| >40 | 332 (28.8) |
| BMI (kg/m2), n (%) | |
| <19 | 63 (5.5) |
| 19–24 | 692 (60.1) |
| >24 | 397 (34.5) |
| Gravidity, mean ± SD (range) | 1±1 (0–7) |
| Parity, mean ± SD (range) | 1±1 (0–3) |
| Normal menstrual cycle*, n (%) | 892 (77.4) |
| Reasons of visit, n (%) | |
| N | 739 |
| Reproductive tract infection | 267 (36.1) |
| Abnormal uterine bleeding | 184 (24.9) |
| Gynecological tumor | 106 (14.3) |
| Endocrine disease | 30 (4.1) |
| Pelvic floor dysfunction | 25 (3.4) |
| Intrauterine echogenic mass | 20 (2.7) |
| Cervical intraepithelial neoplasia | 12 (1.6) |
| Physical examination | 56 (7.6) |
| Others | 39 (5.3) |
Normal menstrual cycle was assessed by the patients. BMI, body mass index; SD, standard deviation.