TABLE 3

Impact of health status on lung function

HealthyHealthy plus
Preterm/low birthweight#Prior asthma  Symptomatic at test
Subjects n1520167618251901
Boys45454646
Test occasions n2199243126262767
FEV1 z-score0.03±0.900.02±0.900.00±0.91−0.01±0.92
FVC z-score0.17±0.920.17±0.920.17±0.920.16±0.93
FEV1/FVC z-score−0.27±0.95−0.28±0.95−0.31±0.96−0.32±0.97
  • Data presented are % or mean±sd, unless otherwise stated. FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity. #: <2.5 kg; : with technically acceptable spirometry results.