Table 1

Characteristics of 2006 cohort members and the association between selected factors and cytological finding from the baseline sputum sample, University of Colorado Lung Cancer Specialized Program of Research Excellence cohort, 1993–2001a

Cohort characteristicsBaseline sputum cytological reading
UnreadableNormal or squamous metaplasiaMild atypiaModerate atypiaWorse than moderate atypiaModerate atypia or worse
n%n%n%n%n%n%n%
Total cohort200610023411.743821.898048.832216.1321.635417.7
Gender
 Female59729.78213.713823.129048.68213.750.88714.6
 Male140970.315210.830021.369049.024017.0271.926719.0
Age
 30–59 years42421.1368.58620.322152.17417.571.78119.1
 60–69 years79339.48811.118122.839049.212215.4121.513416.9
 70+ years78939.311013.917121.736946.812616.0131.713917.6
Race/ethnicity
 Caucasian186793.121511.541822.491048.729715.9271.532417.4
 Hispanic613.0813.169.83150.81524.611.61626.2
 African American532.6713.2917.02343.41018.947.61426.4
 Asian, Native American, Other251.3416.0520.01664.000.000.000.0
Lifetime smoking
 Quartile 1 < 43 pack-years44822.34710.59922.123552.56113.661.36715.0
 Quartile 2 43–54 pack-years47423.66012.710221.521445.28818.6102.19820.7
 Quartile 3 55–80 pack-years59129.57011.813222.328948.99516.150.910016.9
 Quartile 4 ≥ 81 pack-years49324.65711.610521.324249.17815.8112.28918.1
Smoking status
 Current smoker81940.8708.615418.842852.315018.3172.116720.4
 Former smoker118759.216413.828423.955246.517214.5151.318715.8