. Author manuscript; available in PMC: 2017 Mar 1.

Published in final edited form as: Int J Public Health. 2016 Jan 5;61(2):199–207. doi: 10.1007/s00038-015-0774-8

Table 4.

Comparison of selected characteristics across latent classes of e-cigarette and alternative tobacco products use among grade 9 high school students, Tirgu Mures, Romania, 2014

	Class 1 MPU-MS n = 322	Class 2 MPU-HS n = 71	Class 3 SU n = 409	Class 4 NU n = 1033	p
Female (%)	51.4_^a	31.6_^b	50.6_^a	58.2_^c	<0.001^*
Age [mean (SE)]	14.9 (0.03)	15.0 (0.06)	14.9 (0.02)	14.9 (0.02)	0.201
Romanian (%)	44.2_^a	44.6_^a^c	64.0_^b	55.5_^c	<0.001^*
Vocational school (%)	71.4	70.4	71.6	68.1	0.771
Grades [mean (SE)]	3.8 (0.06)	3.7 (0.13)	3.9 (0.05)	4.0 (0.04)	0.026
Household smoking (% yes)	69.1	60.8	61.1	54.5	0.08
≥50 % friends smoke (%)	51.4_^a	76.8_^b	29.5_^c	21.4_^d	<0.001^*
Tried smoking (%)	95.9_^a	98.1_^a	53.0_^b	28.8_^c	<0.001^*
Current smokers (%)	51.5_^a	77.5_^b	19.9_^c	9.4_^d	<0.001^*
Sensation-seeking [mean (SE)]	29.3_^a (0.32)	31.0_^a (0.91)	26.0_^b (0.31)	24.6_^c (0.25)	<0.001^*
Depressive symptoms [mean (SE)]	16.2 (0.55)	17.8 (1.63)	14.3 (0.46)	14.8 (0.38)	0.005
Negative consequences (Cons) [mean (SE)]	3.8_^a (0.06)	3.4_^b (0.13)	4.0_^c (0.05)	4.0_^c (0.04)	<0.001^*
Coping–reinforcement [mean (SE)]	2.2_^a (0.05)	2.7_^b (0.14)	1.7_^c (0.04)	1.7_^c (0.03)	<0.001^*
Social benefits [mean (SE)]	1.7_^a (0.04)	1.8_^a (0.10)	1.5_^b (0.03)	1.5_^b (0.02)	<0.001^*

Calculation across classes is based on using posterior probability-based multiple imputations

MPU-MS multi-product users with moderate smoking, MPU-HS multi-product users with high smoking, SU selective users, NU non-users

Omnibus test was statistically significant after the Bonferroni correction (p < 0.004)

^{a, b, c, d}

Means or proportions sharing a common superscript are not statistically different at p < 0.05 according to pairwise comparisons using Wald χ² test