Table 3.

Age at lung cancer diagnosis among those unexposed or exposed to childhood secondhand smoke

NCI-MD studyPMayo Clinic studyP
Unexposed during childhoodExposed during childhoodUnexposed during childhoodExposed during childhood
nAge in y (mean ± SD)nAge in y (mean ± SD)nAge in y (mean ± SD)nAge in y (mean ± SD)
Never smokers1767.0 ± 9.82852.1 ± 9.6<0.0017463.0 ± 13.39856.8 ± 12.90.035
Former smokers5571.5 ± 8.425070.0 ± 9.40.167
Current smokers3765.4 ± 9.623662.5 ± 8.30.054