Summary of data by centre before exclusions

Participants nEquipmentEuropean ancestryObeseFEV1 z-score
France184Jaeger MasterScreen97.810.90.24±0.92
Italy3705SensorMedics Vmax100.024.00.31±0.96
Australia128Eco Medics Exhalyzer93.08.6
Australia66SensorMedics Vmax100.04.60.26±0.91
French Polynesia113CosMed22.139.80.67±1.00
Australia123SensorMedics Spectra100.08.10.23±0.90
Germany58ndd EasyOne Pro Lab100.08.6
Australia91SensorMedics Spectra100.04.4
Mexico132Jaeger Master Screen100.07.60.20±0.97
Spain545Jaeger Master Screen100.00.0−0.02±0.90
Mexico164ndd EasyOne Pro Lab100.011.60.10±1.18
Mexico453ndd EasyOne Pro Lab100.04.4
Switzerland82Eco Medics Exhalyzer100.02.4
Netherlands723Jaeger Master Screen100.04.0
United States59Medisoft BodyBox0.011.90.69±0.97
United Kingdom160Jaeger Master Screen71.98.1−0.06±1.05

Data are presented as % or mean±sd, unless otherwise stated. Summary of data submitted to the Global Lung Function Initiative (GLI) lung volumes task force. Obesity was defined as body mass index (BMI) >95th centile in children and BMI >30 kg·m−2 in adults (aged >18 years). Some centres (n=11) submitted spirometry data from which the mean±sd of the forced expiratory volume in 1 s (FEV1) z-score was calculated using the GLI 2012 spirometry equations [1].