Table I.
Sociodemographic and Clinical Characteristics
| Boys N=2465 |
Girls N=2363 |
p value | |
|---|---|---|---|
| Age, mean (SE) | 15.5 (0.07) | 15.3 (0.09) | 0.02 |
| Race and ethnicity, % | 0.25 | ||
| White | 62.1 | 58.6 | |
| Black | 13.6 | 15.1 | |
| Hispanic | 18.0 | 19.2 | |
| Other | 6.3 | 7.1 | |
| Family income to poverty threshold Ratio, mean (SE) |
2.6 (0.07) | 2.5 (0.07) | 0.06 |
| Asthma Prevalence and Morbidity % (SE) | |||
| History of asthma | 14.4 (1.0) | 15.7 (0.8) | 0.38 |
| Current asthma | 6.5 (0.7) | 8.5 (0.6) | 0.04 |
| Wheezing/whistling | 9.3 (0.7) | 10.7 (1.0) | 0.25 |
| Asthma attack | 2.8 (0.4) | 4.3 (0.6) | 0.10 |
| Asthma-related ED visit | 0.7 (0.2) | 0.7 (0.2) | 0.86 |
| Wheezing-related medical visit | 2.9 (0.5) | 4.2 (0.6) | 0.09 |
| Wheezing-related missed days | 2.2 (0.5) | 2.9 (0.6) | 0.32 |
| Wheezing related to exercise | 3.8 (0.6) | 5.9 (0.8) | 0.04 |
| BMI and Fitness | |||
| BMI category, % | 0.84 | ||
| Normal weight | 67.8 | 68.9 | |
| Overweight | 16.1 | 15.5 | |
| Obese | 16.1 | 15.6 | |
| Estimated VO2 max, mean (SE) |
46.2 (0.37) | 38.4 (0.27) | <0.001 |
| Fitness tertiles, mean estimated VO2 max(range) |
0.09 | ||
| Tertile 1 | 37.0 (24.2, 41.7) | 30.9 (20.1, 34.6) | |
| Tertile 2 | 45.1 (41.7, 48.9) | 37.5 (34.6, 40.5) | |
| Tertile 3 | 56.6 (48.9, 76) | 48.1 (40.5, 76) | |
p value generated from chi square for differences (Pearson) in dichotomous or categorical outcomes.
p value generated from t test for differences in means for continuous outcomes.