Table 2

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

PathwaysYouthYoung AdultsAdults 25+
Unweighted Sample SizeWeighted Sample SizeWeighted %CIUnweighted Sample SizeWeighted Sample SizeWeighted %CIUnweighted Sample SizeWeighted Sample SizeWeighted %CI
Never use across all three waves6,24513,830,87789.3a (88.4-90.1)9957,630,85986.6b (83.9-88.9)1,95548,675,65497.3a,b (96.3-98.0)
Initiated exclusive use at W2 - remain exclusive at W389217,7361.4a (1.1-1.8)23150,3021.7b (1.0-2.9)10203,5070.4†a,b (0.2-0.8)
Initiated exclusive use at W2 - PTU at W359149,4311.0a (0.7-1.3)545,1210.5†(0.2-1.3)122,4020.0†a (0.0-0.3)
Initiated exclusive use at W2 - no use at W3147345,5212.2a (1.9-2.6)44317,0793.6b (2.5-5.1)15380,3340.80a,b (0.5-1.2)
Initiated PTU at W2 - remain PTU at W34189,2320.6a (0.4-0.8)1593,4331.1b (0.6-1.8)130,6110.1†a,b (0.0-0.5)
Initiated PTU at W2 - exclusive use at W33373,8380.5a (0.3-0.7)1198,4421.1†b (0.5-2.3)120,5140.0†a,b (0.0-0.2)
Initiated PTU at W2 - no use at W32450,2940.3(0.2-0.5)846,2970.5†(0.2-1.2)258,5930.1†(0.0-0.5)
Initiated exclusive use at W3227515,8553.3a (2.9-3.9)49354,1564.0b (2.9-5.5)20562,6671.1†a,b (0.6-2.1)
Initiated PTU at W3100223,1951.4a (1.2-1.7)1173,8380.8†(0.4-1.6)382,5160.2†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.