| | Covariate | Statistics | β (95% CI) | P value |
| | Age (years) | 46.39 ± 5.64 | 0.18 (−1.00, 1.37) | 0.7608 | | BMI (kg/m2, mean ± SD) | 25.61 ± 13.86 | −0.21 (−0.69, 0.27) | 0.3988 | | Gravidity (n) | 3(0–9) | −2.18 (−6.64, 2.28) | 0.3386 | | Parity (n) | 2 (0–5) | 3.29 (−6.01, 12.59) | 0.4888 | | Gravidity (n, %) | | | | | 0 | 7 (1.45%) | Reference | | | 1 | 34 (7.04%) | −32.96 (−93.72, 27.81) | 0.2883 | | 2 and more | 442 (91.51%) | −30.42 (−86.19, 25.36) | 0.2856 | | Parity (n, %) | | | | | 0 | 11 (2.28%) | Reference | | | 1 | 187 (38.72%) | −18.25 (−63.60, 27.10) | 0.4306 | | 2 and more | 285 (59.01%) | −7.13 (−52.04, 37.78) | 0.7559 | | Menstrual regularity, n (%) | | | | | Regular | 456 (94.41%) | Reference | | | Irregular | 27 (5.59%) | 17.37 (−11.59, 46.33) | 0.2404 | | Dysmenorrhea, n (%) | | | | | No | 226 (46.79%) | Reference | | | Yes | 257 (53.21%) | 8.16 (−5.17, 21.50) | 0.2307 | | Menstrual volume | | | | | Low | 12 (2.48%) | Reference | | | Moderate | 295 (61.08%) | 18.79 (−23.70, 61.28) | 0.3865 | | High | 176 (36.44%) | 44.82 (1.78, 87.86) | 0.0418 | | Hypertension, n (%) | | | | | No | 429 (88.82%) | Reference | | | Yes | 54 (11.18%) | −26.49 (−47.50, −5.48) | 0.0138 | | Diabetes, n (%) | | | | | No | 476 (98.55%) | Reference | | | Yes | 7 (1.45%) | 75.50 (20.15, 130.84) | 0.0078 | | Endometriosis, n (%) | | | | | No | 398 (82.40%) | Reference | | | Yes | 85 (17.60%) | −4.21 (−21.70, 13.28) | 0.6374 | | Benign adnexal tumor, n (%) | | | | | No | 271 (56.11%) | Reference | | | Yes | 212 (43.89%) | 13.34 (−0.03, 26.72) | 0.0511 | | Uterine Leiomyoma | | | | | No | 204 (42.24%) | Reference | | | Yes | 279 (57.76%) | −0.08 (−13.57, 13.41) | 0.9903 | | Uterine adenomyoma | | | | | No | 379 (78.47%) | Reference | | | Yes | 104 (21.53%) | −12.30 (−28.48, 3.87) | 0.1366 | | Uterine volume (cm3) | 210.15 ± 143.12 | 0.04 (−0.01, 0.09) | 0.0847 | | Length (cm) | 7.35 ± 1.73 | 3.83 (−0.01, 7.66) | 0.0513 | | Width (cm) | 7.24 ± 1.71 | 3.80 (−0.09, 7.70) | 0.0563 | | Thickness (cm) | 6.61 ± 1.64 | 3.97 (−0.09, 8.03) | 0.0561 | | Menopause | | | | | No | 464 (96.07%) | Reference | | | Yes | 19 (3.93%) | −57.65 (−91.54, −23.76) | 0.0009 | | Anaemia | | | | | Normal | 178 (36.85%) | Reference | | | Mild | 143 (29.61%) | 42.68 (27.78, 57.58) | <0.0001 | | Moderate | 147 (30.43%) | 65.80 (51.01, 80.58) | <0.0001 | | Severe | 15 (3.11%) | 126.78 (91.12, 162.44) | <0.0001 | | Hemoglobin | 101.29 ± 23.81 | −1.34 (−1.60, −1.09) | <0.0001 | | SII (mean ± SD) | 700.61 ± 444.18 | 0.11 (0.10, 0.12) | <0.0001 |
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