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Clinical and demographic characteristics of study cohorts.
| Characteristic | Training set (N = 1099) | Testing set (N = 120) |
|---|---|---|
| Median age (range) | 12.15 (7-18) | 12.02 (7-18) |
| Sex | ||
| Male | 545 | 54 |
| Female | 554 | 66 |
| Clinical evaluation | ||
| Obstructive | 550 | 60 |
| Nonobstructive | 549 | 60 |
