Table 4 Effect modification by smoking status on the association between cardiac glycosides and lung cancer incidence
From: Cardiac glycosides use and the risk of lung cancer: a nested case–control study
Smoking status | Cases | Controls | Adjusted RR (95% CI)a | P value for interaction |
|---|---|---|---|---|
Never | 134 | 4780 | ||
No use, n (%) | 92 | 3270 | 1.00 (Reference) | 0.37 |
Ever use, n (%) | 42 | 1510 | 1.08 (0.74-1.58) | |
Ever | 1031 | 6531 | ||
No use, n (%) | 722 | 4568 | 1.00 (Reference) | |
Ever use, n (%) | 309 | 1963 | 1.06 (0.90-1.24) | |
Unknown | 72 | 1009 | ||
No use, n (%) | 46 | 690 | 1.00 (Reference) | |
Ever use, n (%) | 26 | 319 | 1.55 (0.93-2.58) |