Table 1 Characteristics of study participants by sex
Variables | Total (n = 712) | Boys (n = 368) | Girls (n = 344) | p-value |
|---|---|---|---|---|
mean (SD) | mean (SD) | mean (SD) | ||
Age (years) | 10.5 (1.81) | 10.7 (1.86) | 10.3 (1.74) | 0.005 |
Height (cm) | 139.9(10.36) | 140.2(10.25) | 139.6(10.49) | 0.410 |
Weight (kg) | 34.4(7.73) | 34.8(7.69) | 34.0(7.67) | 0.156 |
BMI (kg/m2) | 17.4(2.09) | 17.5(2.09) | 17.2(2.09) | 0.036 |
Height for age z-score | −0.15 (0.98) | − 0.24 (0.95) | − 0.05 (1.01) | 0.005 |
Weight for age z-score | −0.02 (0.89) | 0.01 (0.91) | −0.05 (0.87) | 0.162 |
BMI for age z-score | 0.07 (0.90) | 0.19 (0.92) | −0.05 (0.86) | < 0.001 |
FVC z-score | −0.11 (1.01) | −0.08 (0.97) | − 0.15(1.05) | 0.302 |
FEV1 z-score | − 0.36 (0.95) | −0.33(0.90) | − 0.40(0.99) | 0.305 |
FEV1/FVC z-score | − 0.42 (1.16) | −0.42(1.11) | − 0.43(1.21) | 0.916 |
MMEF z-score | − 0.56 (1.05) | −0.48(1.06) | − 0.66(1.02) | 0.018 |