Table 2.
Conditional probabilities of tobacco use among Southern California Children’s Health Study youth (n = 2,091)
| Item | Nonsmokers | Polytobacco experimenters | E-cigarette /hookah users | Polytobacco users |
|---|---|---|---|---|
| Class | ||||
| prevalence | 72.3% | 13.9% | 8.2% | 5.6% |
| Cigarette | ||||
| Never | .974 | .292 | .723 | .155 |
| Ever | .021 | .594 | .222 | .247 |
| Recent | .005 | .114 | .055 | .598 |
| Cigar | ||||
| Never | .994 | .478 | .934 | .109 |
| Ever | .006 | .486 | .000 | .429 |
| Recent | .000 | .036 | .066 | .462 |
| E-cigarette | ||||
| Never | .960 | .234 | .418 | .028 |
| Ever | .036 | .707 | .145 | .143 |
| Recent | .003 | .059 | .437 | .829 |
| Hookah | ||||
| Never | .929 | .241 | .273 | .067 |
| Ever | .054 | .643 | .229 | .310 |
| Recent | .017 | .116 | .497 | .623 |
| Smokeless/dip/chewing | ||||
| Never | .995 | .780 | .950 | .534 |
| Ever | .002 | .160 | .027 | .284 |
| Recent | .003 | .059 | .023 | .182 |
Akaike Information Criterion = 9,387.2; sample-size adjusted Bayesian Information Criterion = 9,493.3; entropy = .83.