Table 1.
Demographic Characteristics of Subjects Included in the 3 Trials
| Characteristic | All Participants | Petrus et al [11] | Prasad et al [12] | Prasad et al [13] |
|---|---|---|---|---|
| All participants | 199 | 101 | 48 | 50 |
| Age (yr) | ||||
| Median | 27.0 | 22.0 | 37.0 | 34.5 |
| Range | 17–61 | 18–54 | 18–61 | 17–60 |
| Males (%) | 41% | 47% | 38% | 34% |
| Allergies (%) | 31% | 46% | 13% | 20% |
| Smokers (%)a | 29% | — | 27% | 30% |
| Ethnic group | ||||
| White (%) | 66% | 72% | 61% | 60% |
| Black (%) | 24% | 15% | 33% | 32% |
| Other (%) | 10% | 13% | 6% | 8% |
aThe Petrus study (1998) did not collect data on smoking, the 29% indicates proportion of the 98 participants in the Prasad trials.