Table 4. Factors related to CC smoking quit attempts in the past year among current CC smokers.

(N = 1,128).

	Attempts to quit CCs at least once vs. no CC quit attempts
	N(%) = 851(74.3%)            N(%) = 277(25.7%)
	Adjusted Odds Ratio	95% Confidence Interval
Sex
Female	1
Male	0.61	0.45–0.83
Age (years)
20–34	1
35–49	0.51	0.37–0.70
50–69	0.48	0.34–0.69
Education
≤High school	1
≥University	1.12	0.85–1.48
Marital status
Never married	1
Married/living with a partner	0.85	0.64–1.13
Separated/widowed/divorced	0.62	0.37–1.02
Income (KRW)a
<3,000,000	1
3,000,000–4,999,999	1.39	1.05–1.83
5,000,000–6,999,999	1.56	1.12–2.16
≥7,000,000	1.57	1.10–2.23
Tobacco use status
HTPs (−) and ECs (−)	1
HTPs (+) and ECs (−)	1.07	0.83–1.38
HTPs (−) and ECs (+)	2.92	1.81–4.69
HTPs (+) and ECs (+)	8.42	4.85–14.62
Numbers of cigarettes per day
≤10	1
11–19	0.53	0.41–0.68
≥20	0.64	0.49–0.85

Adjusted for sex, age, education, marital status, income, tobacco use status, and number of cigarettes per day.

aOR, adjusted odds ratio; CI, confidence interval; CCs, combustible cigarettes; ECs, electronic cigarettes; HTPs, heated tobacco products.

^a KRW, Korean Won (1,000 KRW = 1 USD).

(−), non-use; (+), use.