Mean (range) characteristics of study patients
| Asymptomatic smokers (n=29) | Never smokers (n=16) | p value | |
|---|---|---|---|
| FEV1=forced expiratory volume in 1 second; N2=single breath N2 method; Tlco=carbon monoxide transfer factor; VC=vital capacity. | |||
| Age (years) | 61–62 | 61–62 | |
| Sex (M/F) | M | M | |
| FEV1(% pred) | 92 (67–134) | 109 (91–146) | 0.0005 |
| VC (% pred) | 87 (63–113) | 96 (76–118) | 0.021 |
| N2 (% pred) | 186 (52–360) | 89 (21–157) | <0.0001 |
| Tlco (% pred) | 85 (51–135) | 96 (70–131) | 0.0152 |