Table 4.

ORs and 95% CIs for the association of lung cancer with pneumonia latency (time from first or last known pneumonia diagnosis to lung cancer or interview) using tertiles in controls (based on time from first pneumonia diagnosis), stratified by number of pneumonia diagnoses

Pneumonia latencyBased on first pneumonia diagnosisBased on last known pneumonia diagnosis
n diagnosesTertile (y)n cases*n controls*OR (95% CI)n cases*n controls*OR (95% CI)
0Not applicable1,5551,7461.01,5551,7461.0
1First (1-<23)111840.99 (0.70-1.40)111840.99 (0.70-1.40)
1Second (23-<53)51760.64 (0.41-0.98)51760.64 (0.41-0.98)
1Third (≥53)64720.87 (0.59-1.30)64720.87 (0.59-1.30)
2First (1 to <23)531.83 (0.35-9.55)22141.50 (0.69-3.24)
2Second (23 to <53)1391.63 (0.63-4.23)8110.72 (0.25-2.09)
2Third (≥53)14160.92 (0.41-2.07)441.15 (0.25-5.24)
≥3First (1 to <23)230.43 (0.06-3.31)980.62 (0.21-1.83)
≥3Second (23 to <53)570.33 (0.09-1.23)260.07 (0.01-0.39)
≥3Third (≥53)760.61 (0.15-2.39)350.32 (0.05-2.00)
  • *Numbers do not sum to total due to subjects missing data on other variables included in the multivariate model or subjects who answered “Don't know” for one or more age at diagnosis of pneumonia variable.

  • Referent is no report of pneumonia. Adjusted for study age, gender, region, pack-years, smoking intensity (average packs/d), and chronic bronchitis.