Table 1 Demographic Characteristics of the Population
| Â | Placebo (N= 273) | Levocetirizine (5 mg) (N= 278) | Total* (N= 551) |
|---|---|---|---|
Age at randomization, years | Â | Â | Â |
   Mean (SD) | 30.8 (8.8) | 29.8 (8.9) | 30.3 (8.9) |
   Median | 29.0 | 28.0 | 28.2 |
   Minimum-maximum | 18.1-70.3 | 18.0-66.2 | 18.0-70.3 |
Duration of PER before randomization, years, mean (SD) | 12.8 (8.2) | 11.9 (7.8) | 12.3 (8.0) |
Sex, female | 158 (57.9%) | 152 (54.7%) | 310 (56.3%) |
Working status | Â | Â | Â |
   Working | 196 (72%) | 186 (67%) | 382 (69%) |
   Nonworking | 77 (28%) | 92 (33%) | 169 (31%) |