Table 3 . Frequency distributions of menstrual cycles characteristics and menstrual disturbances in studied groups for female workers in a pharmaceutical factory in Iran .
| Exposure groups | ||||
| Variables | Non-exposed (N=207) | Low-exposed (N=145) | high-exposed (N=73) | P.v |
|
Length of cycle (day) (Mean± SD) |
25.3±3.29 | 26.1±3.75 | 28.3±5.13 | 0.001 |
|
Duration of bleeding (day) (Mean± SD) |
4.7±1.07 | 4.9±1.03 | 5.3±0.79 | 0.001 |
|
Amount of flow (sanitary towels) (Mean± SD) |
3.2±1.24 | 3.6±1.26 | 4.7±1.51 | 0.001 |
|
Dysmenorrhea (yes) N (%) |
91 (43.9) | 76 (52.4) | 44 (60.2) | 0.040 |
| Short menstrual cycle (21 days>) yes N (%) | 5 (2.4) | 6 (4.1) | 5 (6.8) | 0.222 |
| Long menstrual cycle (35 days<) yes N (%) | 11 (5.3) | 10 (6.8) | 12 (16.4) | 0.008 |
|
Irregular menstrual cycle Yes N (%) |
16 (7.7) | 19 (13.1) | 21 (28.7) | 0.001 |
|
Bleeding during menstrual cycle Yes N (%) |
2 (0.9) | 6 (4.1) | 8 (10.9) | 0.001 |
|
Menstrual disturbance Yes N (%) |
17 (8.2) | 23 (15.8) | 21 (28.7) | 0.001 |
SD: Standard Deviation