Table 2.

Awareness of E-cigarette Among Middle School Students

	%	95% CI	OR	95% CI
Overall	45.0	43.5% to 46.5%
Gender
Boys	52.3	50.8% to 53.9%	1.493	1.443% to 1.545%
Girls	36.8	35.3% to 38.3%	reference	—
Age
11–12 y old	36.4	35.1% to 37.6%	reference	—
13 yold	42.1	40.8% to 43.3%	1.154	1.103% to 1.208%
14 y old	47.5	46.0% to 49.1%	1.291	1.217% to 1.369%
15 y old	49.7	47.2% to 52.2%	1.293	1.170% to 1.428%
16–17 y old	49.5	44.9% to 54.1%	1.220	1.041% to 1.429%
Residence
Urban	46.2	44.7% to 47.7%	1.147	1.042% to 1.262%
Rural	44.5	42.6% to 46.5%	reference	—
Pocket money (RMB)
0	39.6	37.1% to 42.1%	reference	—
≤10（Not including 0）	38.1	36.3% to 39.9%	0.994	0.929% to 1.065%
11–20	44.5	42.9% to 46.0%	1.190	1.093% to 1.296%
>20	52.2	50.6% to 53.8%	1.436	1.302% to 1.583%
Ever experimented with cigarette smoking
Yes	65.8	64.2% to 67.3%	1.723	1.626% to 1.824%
No	40.2	38.7% to 41.7%	reference	—
Exposed to tobacco advertisement in last 30 d
Yes	53.6	52.2% to 55.1%	1.550	1.504% to 1.598%
No	37.0	35.5% to 38.5%	reference	—
Exposed to antitobacco media messages in past 30 d
Yes	47.3	45.9% to 48.7%	1.223	1.184% to 1.263%
No	40.8	39.1% to 42.5%	reference	—
Parents smoke
Yes (mother or father or both)	48.8	47.3% to 50.4%	1.250	1.206% to 1.296%
No	40.0	38.5% to 41.5%	reference	—
Closest friends smoke
Yes (some or all)	59.1	57.6% to 60.6%	1.660	1.579% to 1.745%
No	36.4	35.0% to 37.9%	reference	—
Think smoke from other people is harmful to you
Yes	46.3	44.8% to 47.7%	1.216	1.177% to 1.257%
No	41.4	39.7% to 43.0%	reference	—
Ever smoke tobacco or feel like smoking tobacco is the first thing in the morning (smokers)
Never	71.0	68.8% to 73.2%	—	—
Sometimes	81.1	77.6% to 84.6%	—	—
Always	81.4	74.4% to 88.3%	—	—
Want to stop smoking now (smokers)
Yes	74.9	72.8% to 77.1%	—	—
No	72.7	69.5% to 75.9%	—	—
Ever try to stop smoking in past 12 mo (smokers)
Yes	73.4	71.3% to 75.4%	—	—
No	67.3	64.6% to 69.9%	—	—

CI = confidence interval; OR = odds ratio; RMB = renminbi.