Table 1

Transitions in P30D product use at W2 (2014/15) and W3 (2015/16) among W1 (2013/14) P30D SLT users

	Youth						Young Adults						Adults 25+
	W1 Exclusive SLT Use		W1 SLT PTU w/CIGS		W1 SLT PTU w/o CIGS		W1 Exclusive SLT Use		W1 SLT PTU w/CIGS		W1 SLT PTU w/o CIGS		W1 Exclusive SLT Use		W1 SLT PTU w/CIGS		W1 SLT PTU w/o CIGS
Mutually Exclusive Pathways	Weighted %	95% CI	Weighted %	95% CI	Weighted %	95% CI	Weighted %	95% CI	Weighted %	95% CI	Weighted %	95% CI	Weighted %	95% CI	Weighted %	95% CI	Weighted %	95% CI
Persistent SLT use type at all waves Continuing the same W1 use type (exclusive, PTU w/CIGS, or PTU w/o CIGS) at each wave	31.0†	(19.3 to 45.8)	37.2^c	(24.2 to 52.2)	9.5†^c	(2.2 to 32.8)	17.7^a	(11.7 to 25.8)	32.7^a,c	(26.8 to 39.3)	14.7†^c	(7.4 to 27.0)	68.1^a,b	(64.2 to 71.8)	36.8^a,c	(30.7-43.3)	11.6^b,c	(6.3-20.3)
SLT use type reuptake The same broad use type (exclusive or PTU) at W1 and W3 (but a different tobacco use at W2)	N/A	N/A	9.4†^c	(4.2 to 19.7)	36.7†^c	(20.2 to 57.1)	16.7	(10.4 to 25.9)	10.0^c	(6.6 to 14.8)	27.7^c	(17.7 to 40.5)	4.6^a	(2.9 to 7.1)	10.9^a	(8.1-14.5)	15.3†	(7.2-29.7)
SLT use type transition Transition from W1 exclusive use to PTU by W3, or transition from W1 PTU to exclusive use by W3 (without discontinuing all tobacco use at W2)	34.0†^a,b	(21.8 to 48.8)	5.2†^a	(1.7 to 14.9)	9.7†^b	(3.1 to 26.8)	35.5^a,b	(24.7 to 48.0)	9.4^a	(6.3 to 13.8)	13.3†^b	(7.0 to 23.9)	8.6^b	(6.5 to 11.2)	7.7^c	(5.0-11.7)	34.3^b,c	(21.2-50.3)
Switch or discontinue SLT use, but continue other tobacco use W1 exclusive user who switches to another tobacco product by W3 or W1 polytobacco user that discontinues SLT use by W3 but uses another tobacco product (without discontinuing all tobacco use at W2)	9.5†^a	(2.8 to 28.2)	32.8^a	(21.8 to 46.0)	25.3†	(10.6 to 49.1)	4.4†^a,b	(1.9 to 10.2)	40.6^a,c	(34.1 to 47.5)	21.2^b,c	(11.7 to 35.5)	1.6†^a,b	(0.8 to 3.5)	37.5^a,c	(32.5-42.7)	14.1^b,c	(7.9-23.8)
Tobacco use reuptake W1 users who discontinue all tobacco use at W2 and use again at W3	8.0†	(2.4 to 23.2)	4.6†	(1.0 to 18.5)	9.7†	(3.0 to 27.2)	7.3†	(2.9 to 17.1)	1.9†	(0.7 to 4.9)	3.1†	(0.4 to 20.1)	5.7^a	(3.7 to 8.7)	0.2†^a	(0.0-1.6)	1.2†	(0.2-8.9)
Discontinue all tobacco use W1 users who discontinue all tobacco use at either W2 and W3 or just W3	17.5†	(7.8 to 34.6)	11.0†	(4.5 to 24.3)	9.0†	(2.8 to 25.8)	18.4^a	(10.7 to 29.9)	5.3^a	(3.1 to 9.1)	19.9†	(10.6 to 34.5)	11.4	(8.9 to 14.4)	7.0^c	(4.6-10.5)	23.5^c	(13.6-37.3)

Analysis included youth (ages 12-17), young adult (ages 18-24), and adult 25+ (ages 25 and older) W1 P30D SLT 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. All tobacco use is defined as P30D use. Use type refers to exclusive use, PTU w/CIGS, or PTU w/o CIGS.
^adenotes significant difference at p<0.0167 (Bonferroni corrected for three comparisons) between W1 Exclusive SLT Use and W1 SLT PTU w/CIGS.
^bdenotes significant difference at p<0.0167 (Bonferroni corrected for three comparisons) between W1 Exclusive SLT Use and W1 SLT PTU w/o CIGS.
^cdenotes significant difference at p<0.0167 (Bonferroni corrected for three comparisons) between W1 SLT PTU w/CIGS and W1 SLT PTU w/o CIGS.
The logit-transformation method was used to calculate the 95% CIs.
†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; CIGS, cigarettes; N/A, not applicable due to zero cases; P30D, past 30 days; PTU, polytobacco use; SLT, smokeless tobacco; W1, Wave 1; W2, Wave 2; W3, Wave 3; w/, with; w/o, without.