Table 1. Baseline characteristics of subgroups of patients with asthma.
| Variables | Acetaminophen users N = 591 | Ibuprofen users N = 392 | P-value |
|---|---|---|---|
| Age, year (SD) | 4.2 (0.9) | 4.0 (0.9) | 0.008 |
| Sex | 0.02 | ||
| Female (%) | 238 (40.3) | 129 (32.9) | |
| Male (%) | 353 (59.7) | 263 (67.1) | |
| Age at onset of asthma, month (SD) | 26.5 (13.2) | 25.3 (13.3) | 0.15 |
| Asthma exacerbation status in the previous year (%) | 71 (12.0) | 37 (9.4) | 0.21 |
| Emergency visits for asthma (%) | 37 (6.3) | 18 (4.6) | 0.27 |
| Hospitalizations for asthma (%) | 43 (7.3) | 23 (5.9) | 0.39 |
| Medication status in the previous year | |||
| Use of ICS (%) | 116 (19.6) | 61 (15.6) | 0.10 |
| Use of leukotriene receptor antagonist (%) | 150 (25.4) | 115 (29.3) | 0.17 |
| Use of systemic corticosteroids (%) | 267 (45.2) | 156 (39.8) | 0.10 |
| Diagnosed upper respiratory tract infection | |||
| In the previous year (%) | 589 (99.7) | 388 (99.0) | 0.18 |
| In 2010 (%) | 582 (98.5) | 378 (96.4) | 0.04 |
Note:
SD, standard deviation; ICS, inhaled corticosteroids.