Cumulative Incidence of Tobacco Use
| Yearly Study Periods From Date of First Interview | ||||
|---|---|---|---|---|
| Characteristics | 1 No. (%) | 2 No. (%) | 3 No. (%) | 4 No. (%) |
| Note: Because of a loss to follow-up, the denominators vary across the 4 years of the study. The denominators for study years 1 through 4 were 1,027, 989, 944, and 890, respectively, for smoking initiation; and 1,195, 1,157, 1,112, and 1,058, respectively, for the regular smoking outcome. | ||||
| Smoking initiation | 41 (4.0) | 92 (9.3) | 151 (16.0) | 177 (19.9) |
| Regular tobacco use | 68 (5.7) | 87 (7.5) | 97 (8.7) | 109 (10.3) |