Table 1 Demographic characteristics of current smokers stratified by current E-cigarette use—unweighted versus weighted observations (n = 474).

From: E-cigarettes and smoking cessation among adolescent smokers

	Overall case (n = 474)—unweighted	Current smokers at baseline (n = 474)				Current smokers at baseline (n = 474)				P value
		Current E-cigarettes users at baseline (n = 143)		Not current E-cigarettes users at baseline (n = 331)		Current E-cigarettes users at baseline (n = 143)		Not current E-cigarettes users at baseline (n = 331)
		Unweighted observation (n)	Unweighted percentage (%)	Unweighted observation (n)	Unweighted percentage (%)	Weighted OBSERVATION (n)	Weighted percentage (%)	Weighted observation (n)	Weighted percentage (%)
Quit smoking at follow-up
Yes	112	34	23.8	78	23.6	35	24.6	81	24.4	0.982
No	362	109	76.2	253	76.4	107	75.4	249	75.6
Ever used other tobacco products (e.g. cigars, water pipe, pipe, cigarillos ) at baseline
Yes	82	52	36.4	30	9.1	51	36.4	28	8.6	< 0.001***
No	392	91	63.6	301	90.9	90	63.6	301	91.4
Grade level
Junior high	76	27	18.9	49	14.8	26	18.7	45	13.8	0.152
Senior high	398	116	81.1	282	85.2	115	81.4	284	86.2
Sex
Male	365	110	76.9	255	77.0	108	76.1	251	76.2	0.969
Female	109	33	23.1	76	23.0	34	23.9	78	23.8
Father’s highest education level
Below junior high school	136	49	34.3	87	26.3	48	34.1	89	26.9	0.265
Senior or vocational high school	227	60	42.0	167	50.5	59	42.0	162	49.0
Above college	111	34	23.8	77	23.3	34	24.0	80	24.1
Mother’s ethnicity
Han Chinese	387	117	81.8	270	81.6	117	82.8	273	82.7	0.550
Indigenous	57	19	13.3	38	11.5	18	12.5	34	10.4
Foreigner	30	7	4.9	23	6.9	7	4.7	23	6.9
Parents’ employment status
Full-time	428	125	87.4	303	91.5	124	87.8	304	92.1	0.196
Part-time	18	5	3.5	13	3.9	5	3.6	13	3.9
Unemployed	28	13	9.1	15	4.5	12	8.6	14	4.1
Family living arrangement
Parents or extended family	302	92	64.3	210	63.4	93	66.0	214	65.0	0.617
Single parent	108	30	21.0	78	23.6	28	20.1	77	23.5
Grandparents	29	8	5.6	21	6.3	7	5.2	19	5.9
Other relatives	35	13	9.1	22	6.6	12	8.7	19	5.7

	Mean (SD)	Mean	SD	Mean	SD	Mean	SD	Mean	SD	P value
Change in total monthly combustible cigarette consumption from baseline to follow-up^a	74.1(148.9)	72.1	144.0	78.6	160.3	77.1	163.3	70.7	143.7	0.705
CES-D Scale	8.5(2.8)	8.8	2.9	8.4	2.8	8.8	2.9	8.5	2.8	0.170
Peer Support Score	13.4(2.5)	13.2	2.6	13.6	2.4	13.1	2.6	13.6	2.5	0.135
Age	17.9(1.3)	17.8	1.3	18.0	1.3	17.8	1.3	18.1	1.3	0.050

Significant values are in italics.
CES-D Scale: Center for Epidemiologic Studies Depression Scale.
***p value < 0.001; **p value < 0.01; *p value < 0.05.
^aSamples used for analysis are restricted to current smoker at both baseline and follow-up. Current smokers are referred to those who are combustible cigarette users.

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Table 1 Demographic characteristics of current smokers stratified by current E-cigarette use—unweighted versus weighted observations (n = 474).

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