Table 2.
Overall Bleeding Patterns and Bleeding Patterns Following an Ovulatory or Anovulatory Cycle Categorized by Volume of Menstrual Blood Loss, BioCycle Study, Buffalo, New York, 2005–2007
| No. of Cycles | Menstrual Blood Loss per Cyclea |
||||
| Overall, mL | Light (≤36.5 mL) | Medium (>36.5–≤72.5 mL) | Heavy (>72.5 mL) | ||
| All cycles | 470 | 45.5 (57.5) | 15.2 (16.4) | 54.4 (16.3) | 114.4 (51.0) |
| Following an anovulatory cycle | 23 | 29.6 (95.0)b | 6.8 (10.5) | N/A | 107.4 (60.8) |
| Following an ovulatory cycle | 212 | 47.2 (62.0)b | 16.1 (13.0) | 55.1 (17.5) | 113.0 (47) |
Abbreviations: IQR, interquartile range; N/A, not available (no women fell into this category of menstrual blood loss following an anovulatory cycle).
a
Results are presented as the geometric mean (IQR).
b
Menstrual blood loss following an ovulatory versus anovulatory cycle: P = 0.070.