Table 1

Demographic and smoking information on cases and controls

Cases (n = 235)Controls (n = 213)OR (95% CI)aPb
n%n%
Sex0.34
Female5322.64018.8NDc,d
Male18377.417381.2
Race0.42
White21591.519892.7NDd
Black198.1136.1
Othere10.420.9
Age range (yr)0.19
<606025.56731.5
60–709038.38941.8NDd
>708536.25726.8
Mean age (SD)65.6 (10.7)63.3 (10.4)0.02f
Smoking historyg<0.001
Never3816.27836.61ref
Quit13758.310951.23.3 (2.0–5.6)
Current6025.52612.26.5 (3.4–12.5)
Pack-years<0.001
Nonsmoker4117.58037.91ref
1–35 pack-years7632.576362.7 (1.6–4.7)
>35 pack-years117505526.16.1 (3.4–10.6)
Mean pack-years (SD)40.1 (35.5)24.2 (32.2)<0.001f
Years smoked<0.001
Nonsmoker3715.97736.31ref
1–34 years smoked9239.59243.42.9 (1.7–4.9)
>34 years smoked10444.64320.36.3 (3.5–11.2)
Mean years smoked (SD)29.5 (19.8)16.8 (16.8)<0.001f
  • a Adjusted for age, sex, and race.

  • b χ2 test for homogeneity of proportions in contingency table.

  • c ND, not determined.

  • d Cases and controls were frequency-matched on these variables.

  • e American Indian/Alaska native (2) and double racial heritage (1) .

  • f Student’s t test.

  • g Differences in numbers between “Never” and “Pack-years Nonsmoker” and “Years smoked Nonsmoker” are explained by the differences in definition of Nonsmoker within each variable.