Table 3

Lung cancer incidence as related to selected factors among the 2006 members of the University of Colorado Lung Cancer Specialized Program of Research Excellence cohort, 1993–2001

Person-yearsLung cancer casesLung cancer incidence rate per 100 person-years (95% confidence interval)Incidence rate ratio (95% confidence interval)
Total cohort4469.37831.86 (1.46, 2.26)
Gender
 Female1236.98191.54 (0.85, 2.23)1.0 (reference)
 Male3232.25641.98 (1.49, 2.47)1.29 (0.77, 2.15)
Age
 30–59 years887.01141.58 (0.75, 2.40)1.0 (reference)
 60–69 years1854.03301.62 (1.04, 2.20)1.03 (0.54, 1.93)
 70+ years1729.49392.26 (1.55, 2.96)1.43 (0.76, 2.63)
Race/ethnicity
 Caucasian4198.88791.88 (1.47, 2.30)1.0 (reference)
 Hispanic119.3810.84 (0, 2.48)0.45 (0.06, 3.20)
 African American112.0432.68 (0, 5.70)1.42 (0.45, 4.51)
 Asian, Native American, other40.580
Lifetime smoking history
 Quartile 1 < 43 pack-years877.63111.25 (0.51, 1.99)1.0 (reference)
 Quartile 2 43–54 pack-years1077.88181.67 (0.90, 2.44)1.33 (0.63, 2.82)
 Quartile 3 55–80 pack-years1345.71231.71 (1.01, 2.41)1.36 (0.66, 2.80)
 Quartile 4 ≥ 81 pack-years1168.90312.65 (1.27, 3.59)2.12 (1.06, 4.21)
Smoking status
 Current smoker1818.99402.20 (1.52, 2.88)1.36 (0.88, 2.09)
 Former smoker2651.76431.62 (1.14, 2.11)1.0 (reference)
Baseline sputum cytology
 Unreadable615.4260.97 (0.19, 1.76)0.76 (0.28, 2.06)
 Normal860.67111.28 (0.52, 2.03)1.0 (reference)
 Mild atypia2064.86321.55 (1.01, 2.09)1.21 (0.61, 2.41)
 Moderate atypia864.25192.20 (1.21, 3.19)1.72 (0.82, 3.61)
 Worse than moderate atypia64.961523.09 (11.41, 34.78)18.07 (8.30, 39.34)
 Moderate atypia or worse929.25343.66 (2.43, 4.89)2.86 (1.45, 5.65)