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Prevalence of successful spirometry stratified by age.
| Age at testing | Acceptability ≥ 1 acceptable effort No. (%) | Repeatability ≥ 1 repeatable effort No. (%) |
|---|---|---|
| 4 years old | 53 (84.1) | 32 (50.7) |
| 5 years old | 151 (81.6) | 103 (55.7) |
| Total | 204 (82.3) | 135 (54.4) |
