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Table 3 Transition probabilities* from wave 1 to wave 2 with 95% confidence intervals among adults continuing from PATH wave 1 to wave 2 (n = 26,446)

From: The impact of cigarette and e-cigarette use history on transition patterns: a longitudinal analysis of the population assessment of tobacco and health (PATH) study, 2013–2015

Wave 1 study group/subgroup n Wave 2 product use state
Exclusive cigarette smoking % (CI) Dual use % (CI) Exclusive e-cigarette use % (CI) Neither % (CI)
1. Exclusive cigarette smoker 8613 76.4 (75.3, 77.4) 4.3 (3.8, 4.9) 1.3 (1.1, 1.6) 18.0 (17.0, 19.0)
 1.1. Experimental cigarette smoker 1396 36.7 (34.1, 39.3) 1.3 (0.8, 2.1) 1.8 (1.2, 2.9) 60.2 (57.5, 62.8)
 1.2. Established cigarette smoker without a history of e-cigarette use 6887 84.4 (83.3, 85.4) 4.1 (3.6, 4.7) 1.1 (0.9, 1.4) 10.4 (9.5, 11.4)
 1.3. Established cigarette smoker with a history of e-cigarette use 330 66.4 (60.9, 71.5) 23.1 (18.4, 28.6) 3.7 (2.1, 6.3) 6.8 (4.1, 11.0)
2. Exclusive e-cigarette user 580 12.0 (9.4, 15.4) 10.4 (7.9, 13.5) 45.0 (40.8, 49.3) 32.6 (28.2, 37.2)
 2.1. Experimental e-cigarette user without a history of cigarette smoking 120 7.51 (3.9, 13.9) - 2 10.61 (5.7, 18.7) 80.6 (71.7, 87.2)
 2.2. Experimental e-cigarette user with a history of cigarette smoking 94 30.0 (21.1, 40.7) - 2 14.4 (8.1, 24.3) 51.8 (41.0, 62.4)
 2.3 Established e-cigarette user without a history of cigarette smoking 77 8.21 (3.8, 16.6) - 2 62.2 (49.8, 73.2) 25.9 (15.6, 39.7)
 2.4 Established e-cigarette user with a history of cigarette smoking 289 8.5 (5.8, 12.5) 16.8 (12.7, 21.9) 62.4 (56.7, 67.8) 12.3 (8.3, 17.7)
3. Dual user 2132 54.9 (52.1, 57.6) 28.0 (25.7, 30.3) 6.0 (4.8, 7.5) 11.1 (9.7, 12.7)
 3.1 Experimental dual user 1340 67.2 (64.1, 70.2) 13.4 (11.6, 15.5) 5.1 (3.8, 6.8) 14.3 (12.3, 16.7)
 3.2 Established dual user 792 34.3 (30.2, 38.6) 52.3 (48.0, 56.6) 7.6 (5.9, 9.9) 5.8 (4.3, 7.8)
  1. * Records with wave 2 status missing are excluded in the calculation
  2. 1The estimator is statistically unreliable because the coefficient of variation is greater than or equal to 30 but less than or equal to 50
  3. 2The estimator is suppressed because there were fewer than 50 total respondents in the group of interest or if coefficient of variation is greater than 50