TABLE 1

Group characteristics and lung function of 145 children excluded from analysis by criteria 1 and 2

Congenital abnormality#Sickle cell diseaseCurrent asthmaTotal
Subjects n912124145
Boys78175654
White56173232
Test occasions n818192218
Age at test years8.6±1.888.4±1.838.7±1.558.7±1.58
Height+ z-scores−0.17±1.870.51±1.030.27±1.290.28±1.3
FEV1 z-scores0.19±2.68−0.50±1.01−0.27±1.04−0.27±1.13
FVC z-scores0.27±2.82−0.37±1.000.22±0.990.17±1.10
FEV1/FVC z-scores−0.05±0.90−0.29±1.04−0.85±0.96−0.77±0.98
  • Data presented are % or mean±sd, unless otherwise stated. FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity. #: congenital or neurological abnormalities, n=6; growth abnormalities, n=3; : with technically acceptable spirometry results; +: defined according to [12].