Baseline and follow up characteristics of the study population
| Visit 1 | Visit 2 | Visit 3 | |||
|---|---|---|---|---|---|
| No follow up visits (n = 10) | One follow up visit (1983 or 1995)(n = 12) | Two follow up visits (n = 94) | (n = 100) | (n = 100) | |
| *Significantly different from the group with no follow up visits. | |||||
| †Eosinophilia: 0–5 years: ⩾500 × 106 cells/l, 6–10 years: ⩾400 × 106 cells/l, 11–15 years: ⩾350 × 106 cells/l,>15 years: ⩾250 × 106 cells/l. | |||||
| Mean (SD) age (years) | 9.7 (2.2) | 9.8 (2.1) | 9.7 (2.0) | 26.3 (2.5) | 37.6 (2.2) |
| Mean (SD) FEV1 (% predicted) | 81.8 (17.2) | 84.3 (12.2) | 82.2 (17.9) | 84.3 (14.7) | 86.1 (15.3) |
| Mean (SD) FEV1%VC | 77.2 (10.4) | 78.1 (8.8) | 75.1 (12.3) | 72.1 (10.6) | 69.6 (9.6) |
| Sex (% male) | 30.0 | 91.7* | 68.1* | 70.0 | 69.0 |
| PC10 ⩽16 mg/ml (%) | 80.0 | 100.0 | 80.9 | 29.8 | 51.6 |
| Eosinophilia† (%) | 25.0 | 63.6 | 43.6 | 30.1 | 29.3 |
| Start symptoms before or at 3 years (%) | 70.0 | 91.7 | 66.0 | 68.0 | 67.0 |