Summary of transitions in P30D exclusive tobacco or polytobacco use at W2 (2014/15) and W3 (2015/16) among W1 (2013/14) never tobacco users
| Pathways | Youth | Young Adults | Adults 25+ | |||||||||
| Unweighted Sample Size | Weighted Sample Size | Weighted % | CI | Unweighted Sample Size | Weighted Sample Size | Weighted % | CI | Unweighted Sample Size | Weighted Sample Size | Weighted % | CI | |
| Never use across all three waves | 6,245 | 13,830,877 | 89.3a | (88.4-90.1) | 995 | 7,630,859 | 86.6b | (83.9-88.9) | 1,955 | 48,675,654 | 97.3a,b | (96.3-98.0) |
| Initiated exclusive use at W2 - remain exclusive at W3 | 89 | 217,736 | 1.4a | (1.1-1.8) | 23 | 150,302 | 1.7b | (1.0-2.9) | 10 | 203,507 | 0.4†a,b | (0.2-0.8) |
| Initiated exclusive use at W2 - PTU at W3 | 59 | 149,431 | 1.0a | (0.7-1.3) | 5 | 45,121 | 0.5† | (0.2-1.3) | 1 | 22,402 | 0.0†a | (0.0-0.3) |
| Initiated exclusive use at W2 - no use at W3 | 147 | 345,521 | 2.2a | (1.9-2.6) | 44 | 317,079 | 3.6b | (2.5-5.1) | 15 | 380,334 | 0.80a,b | (0.5-1.2) |
| Initiated PTU at W2 - remain PTU at W3 | 41 | 89,232 | 0.6a | (0.4-0.8) | 15 | 93,433 | 1.1b | (0.6-1.8) | 1 | 30,611 | 0.1†a,b | (0.0-0.5) |
| Initiated PTU at W2 - exclusive use at W3 | 33 | 73,838 | 0.5a | (0.3-0.7) | 11 | 98,442 | 1.1†b | (0.5-2.3) | 1 | 20,514 | 0.0†a,b | (0.0-0.2) |
| Initiated PTU at W2 - no use at W3 | 24 | 50,294 | 0.3 | (0.2-0.5) | 8 | 46,297 | 0.5† | (0.2-1.2) | 2 | 58,593 | 0.1† | (0.0-0.5) |
| Initiated exclusive use at W3 | 227 | 515,855 | 3.3a | (2.9-3.9) | 49 | 354,156 | 4.0b | (2.9-5.5) | 20 | 562,667 | 1.1†a,b | (0.6-2.1) |
| Initiated PTU at W3 | 100 | 223,195 | 1.4a | (1.2-1.7) | 11 | 73,838 | 0.8† | (0.4-1.6) | 3 | 82,516 | 0.2†a | (0.0-0.6) |
Analysis included youth (ages 12-17), young adult (ages 18-24), and adult 25+ (ages 25 and older) W1 never tobacco users with data at all three waves. Respondent age was calculated based on age at W1. W3 longitudinal (all-waves) weights were used to calculate estimates.
Pathways among W1 never tobacco users:
1) Never use across all three waves: Defined as never use of any tobacco products at W2 and W3.
2) Initiated exclusive use at W2 - remain exclusive at W3: Defined as exclusive tobacco product use within the past 30 days at W2 and W3.
3) Initiated exclusive use at W2 - PTU at W3: Defined as exclusive tobacco product use within the past 30 days at W2 and PTU use within the past 30 days at W3.
4) Initiated exclusive use at W2 - no use at W3: Defined as exclusive tobacco product use within the past 30 days at W2 and no use of any tobacco products within the past 30 days at W3.
5) Initiated PTU at W2 - remain PTU at W3: Defined as PTU within the past 30 days at W2 and W3.
6) Initiated PTU at W2 - exclusive use at W3: Defined as PTU within the past 30 days at W2 and exclusive tobacco product use within the past 30 days at W3.
7) Initiated PTU at W2 - no use at W3: Defined as PTU within the past 30 days at W2 and no use of any tobacco products within the past 30 days at W3.
8) Initiated exclusive use at W3: Defined as no use of any tobacco products within the past 30 days at W2 and exclusive tobacco product use within the past 30 days at W3.
9) Initiated PTU at W3: Defined as no use of any tobacco products within the past 30 days at W2 and PTU within the past 30 days at W3.
adenotes significant difference at <0.0167 (Bonferroni corrected for three comparisons) between youth and adults 25+
bdenotes significant difference at <0.0167 (Bonferroni corrected for three comparisons) between young adults and adults 25+
The logit-transformation method was used to calculate confidence intervals.
†Estimate should be interpreted with caution because it has low statistical precision. It is based on a denominator sample size of less than 50, or the coefficient of variation of the estimate or its complement is larger than 30%.
Analyses were run on the W1, W2, and W3 Public Use Files (https://doi.org/10.3886/ICPSR36498.v8).
CI, confidence interval; P30D, past 30-day; PTU, polytobacco use; W1, Wave 1; W2, Wave 2; W3, Wave 3.