Figure 6.

The z-score of the measured values across the whole age in forced vital capacity (FVC, blue line), forced expiratory volume in 1 second (FEV₁, red line) and FEV₁/FVC (green line). The intervals of age are 5 years. SEA-GLI2012 and NEA-GLI2012, multi-ethnic Global Lung Initiative 2012 equations for Southeast and Northeast Asian; Chinese-ECSC1993, European Committee of Steel and Coal equations adjusted for Chinese; Asian-NHANESIII 0.88, the third National Health and Nutrition Examination Surveys equations adjusted with 0.88 times for Asian-American; FVC, forced vital capacity; FEV₁, forced expiratory volume in 1 second.