Table 2– Lung function by age and smoking status
Age categorySubjects nMales %BMI kg·m−2FEV1 % pred#FVC % pred#FEV1/FVC % pred#
25–40 yrs
 Ever-smokers47438.027.49±0.27102.48±0.68107.68±0.6396.69±0.37
 Never-smokers70443.028.21±0.23103.82±0.52106.36±0.5199.12±0.29
 All subjects117841.027.92±0.17103.28±0.41106.89±0.3998.14±0.23
41–50 yrs
 Ever-smokers63441.628.79±0.2496.60±0.67103.00±0.5894.92±0.41
 Never-smokers65542.128.80±0.24103.72±0.53106.07±0.5399.65±0.27
 All subjects128941.928.80±0.17100.22±0.43104.56±0.4097.32±0.25
51–60 yrs
 Ever-smokers65244.229.07±0.2390.97±0.7998.43±0.6892.56±0.49
 Never-smokers49236.629.33±0.26100.84±0.68103.91±0.6798.71±0.36
 All subjects114440.929.18±0.1795.22±0.55100.79±0.4995.21±0.33
61–90 yrs
 Ever-smokers74451.328.75±0.2082.70±0.8391.74±0.7488.58±0.54
 Never-smokers48727.929.20±0.2597.40±0.8397.63±0.8198.61±0.39
 All subjects123142.128.92±0.1688.51±0.6394.07±0.5692.55±0.39
All subjects
 Ever-smokers250444.528.60±0.1292.12±0.4199.35±0.3692.76±0.25
 Never-smokers233838.328.82±0.12101.83±0.32103.94±0.3199.07±0.16
 All subjects484241.528.71±0.0896.80±0.27101.57±0.2495.81±0.16
  • Data are presented as mean±se, unless otherwise stated. BMI: body mass index; FEV1: forced expiratory volume in 1 s; % pred: % predicted; FVC: forced vital capacity. #: using the prediction equations of Knudson et al. [9].