TABLE 1.
Characteristics of the study population and results from pulmonary function tests.
| Variable | All (n = 96) | Males (n = 43) | Females (n = 53) | p a |
|---|---|---|---|---|
| Birth weight (kg) | 3.28 ± 0.04 (2.50, 4.20) | 3.26 ± 0.06 (2.60, 4.20) | 3.30 ± 0.06 (2.50, 4.05) | 0.36 |
| Age (years) | 9.5 ± 1.8 (6.0, 11.9) | 9.6 ± 1.9 (6.0, 11.9) | 9.4 ± 1.8 (6.0, 11.8) | 0.62 |
| Weight (kg) | 36.1 ± 11.0 (16.8, 65.9) | 35.1 ± 10.0 (16.8, 61.5) | 36.9 ± 11.8 (17.1, 65.9) | 0.44 |
| Height (cm) | 135 ± 12 (109, 161) | 134 ± 11 (109, 152) | 136 ± 12 (111, 161) | 0.34 |
| BMI (kg/m2) | 19.3 ± 3.6 (13.4, 27.7) | 19.3 ± 3.6 (13.8, 27.7) | 19.4 ± 3.7 (13.4, 27.2) | 0.84 |
| zBMI | 1.02 ± 1.24 (−1.54, 4.02) | 1.06 ± 1.3 (−1.42, 4.02) | 0.98 ± 1.19 (−1.54, 3.73) | 0.74 |
| zR5 | 0.33 ± 0.80 (−1.31, 2.25) | 0.27 ± 0.80 (−1.23, 2.23) | 0.38 ± 0.80 (−1.31, 2.25) | 0.52 |
| zR20 | 0.39 ± 0.85 (−2.45, 2.44) | 0.34 ± 0.82 (−1.38, 2.44) | 0.43 ± 0.88 (−2.45, 1.96) | 0.63 |
| zR5‐R20 | −0.01 ± 0.94 (−2.85, 4.80) | −0.01 ± 1.03 (−2.85, 4.80) | 0 ± 0.83 (−1.50, 2.30) | 0.99 |
| zX5 | −0.32 ± 0.73 (−2.34, 1.60) | −0.29 ± 0.68 (−1.99, 1.60) | −0.35 ± 0.78 (−2.34, 1.08) | 0.69 |
| zX20 | −0.29 ± 0.82 (−2.57, 2.62) | −0.15 ± 0.77 (−1.55, 1.59) | −0.40 ± 0.84 (−2.57, 2.62) | 0.13 |
| zFres | 0.29 ± 1.02 (−2.35, 2.33) | 0.03 ± 0.95 (−2.35, 1.52) | 0.50 ± 1.03 (−2.20, 2.33) | 0.03 |
| zAX | 0.23 ± 0.76 (−1.48, 3.33) | 0.10 ± 0.68 (−1.48, 1.71) | 0.34 ± 0.81 (−0.80, 3.33) | 0.13 |
| zFEV1 | −1.06 ± 1.80 (−6.78, 2.71) | −0.78 ± 1.56 (−3.88, 2.71) | −1.29 ± 1.96 (−6.78, 1.70) | 0.17 |
| zFVC | −0.97 ± 1.95 (−6.68, 4.56) | −0.62 ± 1.84 (−4.37, 4.56) | −1.26 ± 2.01 (−6.68, 2.54) | 0.11 |
| zFEV1/FVC | −0.26 ± 1.01 (−3.32, 2.12) | −0.26 ± 0.84 (−1.94, 2.12) | −0.27 ± 1.14 (−3.32, 2.04) | 0.98 |
| zDLCO | −0.21 ± 1.09 (−4.25, 1.85) | −0.14 ± 0.99 (−2.87, 1.67) | −0.26 ± 1.16 (−4.25, 1.85) | 0.58 |
a
Student's t‐test. All variables from pulmonary function tests and BMI were transformed to their respective z‐scores according to predicted values.
Note: Data correspond to mean ± standard deviation (minimum, maximum).
Abbreviations: AX, reactance area; BMI, body mass index; DLCO, lung diffusion for carbon monoxide; FEV1, forced expiratory volume at first second; Fres, resonance frequency; FVC, forced vital capacity; R, resistances at 5 and 20 Hz; X, reactances at 5 and 20 Hz.