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Table 1 Biometric and spirometric characteristics of the studied subjects.

From: Evaluating the forced oscillation technique in the detection of early smoking-induced respiratory changes

  Control
(n = 28)
Smokers
(n = 28)
p-value
Male/Female 17/11 15/13 -
Age (years) 33.1 ± 8.2 35.1 ± 9.7 ns
Weight (kg) 66.1 ± 11.8 66.1 ± 10.7 ns
Height (cm) 167.4 ± 8.2 166.9 ± 7.9 ns
Pack-years - 11.2 ± 7.3 -
FEV1 (L) 3.7 ± 0.7 3.5 ± 0.9 ns
FEV1 (%) 105.6 ± 11.8 105.1 ± 14.9 ns
FEF25-75% (L) 4.2 ± 1.3 3.8 ± 1.4 ns
FEF25-75% (%) 105.7 ± 27.2 100.9 ± 29.7 ns
FEV1/FVC (%) 85.0 ± 5.4 83.5 ± 6.4 ns
FEF/FVC (%) 95.7 ± 24.9 89.6 ± 29.6 ns
  1. ns: non-significant; FEV1: forced expiratory volume in one second; FVC: forced vital capacity; FEF: forced expiratory flow; %: percentage of the predicted value. Pack-years was calculated multiplying the mean number of packs (one pack = 20 cigarettes) consumed daily by the number of years that the subject had their smoking habit.