From: Association between cigar use, with and without cigarettes, and incident diagnosed COPD: a longitudinal cohort study
Interval
Total
COPD Diagnosis
Censored
Hazard Estimatea
Period 1 (W1-W2)
9,559
308
578
0.024
Period 2 (W2-W3)
8,673
243
687
0.0197
Period 3 (W3-W4)
7,743
154
732
0.014
Period 4 (W4-W5)
6,857
201
6,656