Table 2.
Joint Classification Membership Based on a Dual Trajectory Model of Cigarette Smoking and Smokeless Tobacco
| Smokeless tobacco, n (%) | Total | |||||
|---|---|---|---|---|---|---|
| (1) early onset, then cessation | (2) consistent abstainer from smokeless tobacco | (3) late onset, escalating | (4) consistent regular | |||
| Cigarette smoking, n (%) | (1) consistent abstainer from cigarettes | 166 (7.44) | 3 (0.13)a | 20 (0.90) | 460 (20.63) | 649 (29.10) |
| (2) late onset intermittent, then cessation | 13 (0.58) | 129 (5.78) | 24 (1.08) | 48 (2.15) | 214 (9.60) | |
| (3) early onset regular, then cessation | 40 (1.79) | 150 (6.73) | 13 (0.58) | 32 (1.43) | 235 (10.54) | |
| (4) delayed onset regular, then cessation | 4 (0.18) | 191 (8.57) | 18 (0.81) | 57 (2.56) | 270 (12.11) | |
| (5) consistent regular Total | 144 (6.46) | 597 (26.77) | 64 (2.87) | 57 (2.56) | 862 (38.65) | |
| 367 (16.46) | 1070 (47.98) | 139 (6.23) | 654 (29.33) | 2230 (100.00) | ||
The model was constructed using dual trajectory analysis under the assumption of zero-inflated Poisson distributions for both variables.
aThis value of 3 represents error in the model.