Table 2.
Characteristics of 591 Participants from 202 Families Used for a Genome Scan of Multiple Asthma Traits
| Characteristics | Parents | Twins and Sibs |
| Subjects: | ||
| Total | 180 | 411 |
| With questionnaire | 7% | 100% |
| With full testing | 0% | 99% |
| Female sex | 59% | 57% |
| Mean (range) age [years] | 63 (45–80) | 38 (22–75) |
| Ever a smoker | 46% | 50% |
| Current smoker | 0% | 26% |
| Asthma | 23% | 38% |
| Doctor-diagnosed asthma | 23% | 31% |
| Positive BHR test | … | 48% |
| Atopy | … | 73% |
| Positive SPT for D. pteronyssinusa | … | 58% |
| FEV1⩽0.7 predicted | … | 6% |
| Mean (range) FEV1 | … | 3.3 (.7–5.7) |
| Mean (range) FEV1/FVC | … | .8 (.4–1.0) |
| IgE geometric mean (range) [IU/ml] | … | 71 (.6–6,908) |
a
SPT = skin-prick test.