Table IV.
Some menstrual characteristics of students with/without dysmenorrhea.
| Dysmenorrhea |
||||
|---|---|---|---|---|
| Some characteristics | Yes, n (%) | No, n (%) | Total, n (%) | Statistical analysis, chi-square; P |
| Age at menarche (year) | ||||
| ≤12 | 106 (79.1) | 28 (20.9) | 134 (21.5) | 3.899; 0.142 |
| 13–14 | 282 (71.6) | 112 (28.4) | 394 (63.2) | |
| ≥15 | 65 (68.4) | 30 (31.6) | 95 (15.3) | |
| Menstrual regularity | ||||
| Regular | 359 (72.2) | 138 (27.8) | 497 (79.8) | 0.284; 0.594 |
| Irregular | 94 (74.6) | 32 (25.4) | 126 (20.2) | |
| Menstrual cycle duration (days) | ||||
| ≤20 | 17 (63.0) | 10 (37.0) | 27 (4.3) | 2.135; 0.344 |
| 21–34 | 396 (72.7) | 149 (27.3) | 545 (87.5) | |
| ≥35 | 40 (78.4) | 11 (21.6) | 51 (8.2) | |
| Menstrual bleeding duration (days) | ||||
| ≤6 | 298 (69.6) | 130 (30.4) | 428 (68.7) | 6.565; 0.010 |
| ≥7 | 155 (79.5) | 40 (20.5) | 195 (31.3) | |
| Use of medicine regulating menstruation | ||||
| Yes | 37 (71.2) | 15 (28.8) | 52 (8.3) | 0.010; 0.920 |
| No | 416 (72.9) | 155 (27.1) | 571 (91.7) | |
| Family history | ||||
| Yes | 249 (84.4) | 46 (15.6) | 295 (47.4) | 38.619; 0.000 |
| No | 204 (62.2) | 124 (37.8) | 328 (52.6) | |
| Total | 453 (72.7) | 170 (27.3) | 623 (100.0) | |