Comparing the Characteristics of Cigarette Smoking and e-Cigarette and IQOS Use among Adolescents in Taiwan

Table 4

Three logistic regression models illustrating factors correlated with current use of cigarettes, e-cigarettes, and IQOS.

Independent variable	Y = cigarette				Y = e-cigarette				Y = IQOS
	aOR	95%	CI		aOR	95%	CI		aOR	95%	CI
Gender
Boy	2.50	1.95	3.20	‡	2.36	1.88	2.96	‡	1.68	1.33	2.11	‡
Girl	1				1				1
Grade
7	1				1				1
8	1.12	0.77	1.62		1.19	0.79	1.80		0.72	0.49	1.06
9	1.48	1.00	2.21		0.97	0.64	1.47		0.68	0.46	1.00	∗
10	1.81	1.12	2.93	∗	0.90	0.61	1.33		0.82	0.58	1.15
11	1.75	1.12	2.73	∗	1.18	0.75	1.86		0.52	0.35	0.76	‡
12	1.85	1.15	2.96	∗	1.10	0.75	1.62		0.64	0.43	0.95	∗
Monthly allowance
US$0	1				1				1
US$0.03–49.71	1.19	0.84	1.70		1.20	0.63	2.28		0.66	0.46	0.96	∗
US$49.72–116.03	1.91	1.38	2.66	‡	1.28	0.68	2.41		0.83	0.54	1.28
US$ ≧ 116.04	3.95	2.81	5.56	‡	2.73	1.45	5.12	†	1.44	0.94	2.19
Parent educational level
Junior high school and below	1				1				1
Senior high school	0.67	0.55	0.82	‡	0.85	0.63	1.14		0.80	0.60	1.08
University or college	0.49	0.38	0.64	‡	0.75	0.51	1.08		0.65	0.48	0.90	†
Graduate school	0.59	0.35	1.00	∗	0.70	0.42	1.18		0.72	0.48	1.11
Smoking status of parents
Both smoke	2.57	1.97	3.34	‡	2.02	1.24	3.29	†	1.46	1.02	2.09	∗
Only the father smokes	1.43	1.21	1.68	‡	1.52	1.47	1.56	‡	0.95	0.72	1.25
Only the mother smokes	1.38	0.93	2.03		1.51	0.86	2.68		1.30	0.68	2.48
Neither smokes	1				1				1
Smoking status of close friends
Yes	11.44	8.91	14.68	‡	3.93	3.04	5.08	‡	2.76	2.15	3.54	‡
No	1				1				1
Access to free cigarettes
Yes	3.97	2.95	5.35	‡	3.49	2.48	4.90	‡	4.20	3.06	5.77	‡
No	1				1				1
Exposure to cigarette advertisements
Yes	1.27	1.10	1.46	‡	1.45	1.15	1.83	†	1.14	0.90	1.45
No	1				1				1
Attended classes concerning the dangers of tobacco
Yes	0.59	0.51	0.69	‡	0.77	0.62	0.97	∗	1.02	0.83	1.25
No	1				1				1

aOR: adjusted odds ratios. ^∗ < 0.05; † < 0.01; ‡ < 0.001.