Demographic factors and markers of asthma severity by phase of menstrual cycle; classified by date of emergency department visit
| Preovulatory(days 5 to 11)(n = 225) | Periovulatory(days 12 to 18)(n = 176) | Postovulatory(days 19 to 25)(n = 176) | Perimenstrual(days 26 to 4)(n = 215) | p value | |
|---|---|---|---|---|---|
| ED, emergency department; PEF, peak expiratory flow. | |||||
| *PEF reported as % predicted based on age, sex, and height.33 | |||||
| Mean age (years) | 33 | 35 | 34 | 33 | 0.17 |
| African-American (%) | 75 | 75 | 76 | 76 | 0.99 |
| History of intubation (%) | 15 | 17 | 10 | 14 | 0.30 |
| History of oral corticosteroids (%) | 34 | 32 | 34 | 38 | 0.70 |
| History of ED visit in the past year (%) | 68 | 73 | 67 | 68 | 0.06 |
| Initial PEF (% pred)* | 52 | 45 | 49 | 47 | 0.11 |
| Final PEF (% pred)* | 67 | 62 | 61 | 63 | 0.43 |
| Hospitalised for index exacerbation (%) | 14 | 13 | 18 | 9 | 0.20 |