Table 2. Description of menstrual characteristics among 766 nurses.
| Variable | Mean (SD) | median (min–max) |
|---|---|---|
| Days duration of bleeding period1 | 5.5 (1.4) | 5.0 (2–12) |
| Days between bleeding periods2 | 26.5 (4.8) | 27.0 (10–60) |
| Days of menstrual cycle length | 31.9 (4.9) | 32.0 (20–68) |
| n (%) | ||
| Cycle length2 | ||
| <24 d | 15 (2) | |
| 25–34 d | 578 (81) | |
| >34 d | 120 (17) | |
| Duration of bleeding period3 | ||
| < 5 d | 146 (19) | |
| 5–6 d | 451 (60) | |
| >6 d | 149 (20) | |
| Irregular menstruation (yes) | 115 (15) | |
Persons not answered the question: 113, 253, 313. SD: standard deviation