Sample size (range) | 42–49 | 103–116 | 42–44 | 69–85 | |
| | | | | |
Age (years) | 9.60 (1.34) | 8.99 (1.50) | 9.04 (1.33) | 8.83 (1.47) | |
Standing height (m) | 1.37 (0.10) | 1.33 (0.11) | 1.34 (0.09) | 1.33 (0.10) | 0.050 |
Standing height z score* | 0.20 (0.89) | 0.07 (1.09) | 0.16 (0.94) | 0.10 (1.21) | 0.89 |
Weight (kg) | 35.2 (8.2) | 30.6 (8.6) | 33.3 (8.7) | 31.1 (9.7) | 0.012 |
Weight z score* | 0.49 (0.98) | 0.04 (1.12) | 0.65 (1.04) | 0.24 (1.47) | 0.021 |
BMI (kg/m2) | 18.4 (3.1) | 17.0 (2.9) | 18.3 (3.3) | 17.3 (3.2) | 0.011 |
BMI z score* | 0.51 (1.16) | 0.006 (1.2) | 0.79 (1.17) | 0.30 (1.44) | 0.0032 |
Chest circumference (cm) | 66.8 (6.2) | 64.2 (7. 7) | 67.6 (6.6) | 65.3 (7.9) | |
Chest height (cm) | 23.9 (2.6) | 23.0 (2.5) | 23.9 (2.1) | 23.6 (2.3) | |
Transverse diameter (cm) | 19.6 (1.5) | 18.8 (1.9) | 20.3 (1.6) | 19.5 (2.0) | |
A–P diameter (cm) | 13.8 (1.25) | 13.1 (1.5) | 14.2 (1.4) | 13.6 (1.6) | |
Chest size as a box (l) | 6.58 (1.51) | 5.76 (1.71) | 7.00 (1.66) | 6.39 (1.95) | |
Chest size as cylinder (l) | 8.65 (2.32) | 7.79 (2.64) | 8.88 (2.40) | 8.27 (2.88) | |
FVC (l) | 2.19 (0.39) | 1.80 (0.41) | 2.19 (0.38) | 1.89 (0.43) | |
FEV1 (l) | 1.96 (0.35) | 1.68 (0.36) | 1.93 (0.32) | 1.69 (0.36) | |
PEF (l/s) | 4.22 (0.87) | 3.83 (0.88) | 4.12 (0.90) | 3.87 (0.93) | |
FEF75–25 (l/s) | 2.23 (0.57) | 2.09 (0.59) | 2.10 (0.62) | 1.91 (0.57) | |