Table 2. Odds ratios of age and equivalent income for smokers (only combustible cigarette or HTP) versus non-smoker using multinomial logistic regression analysis.

		OR for being only combustible cigarette smokers	OR for being HTP smokersb
		aORa (95% CI)	aORa (95% CI)
Men	Age, years
(n = 2,443)	20–29	0.50 (0.35–0.71)	7.90 (3.09–20.22)
	30–39	0.79 (0.57–1.09)	5.48 (2.10–14.32)
	40–49	1.15 (0.85–1.56)	4.18 (1.56–11.19)
	50–59	1.14 (0.84–1.55)	2.51 (0.89–7.09)
	60–69	1.00 (reference)	1.00 (reference)
	Equivalent income, JPY/year
	<2 million	1.00 (reference)	1.00 (reference)
	2.00–2.99 million	1.27 (0.93–1.73)	1.74 (0.86–3.53)
	3.00–3.99 million	1.46 (1.07–1.99)	2.67 (1.36–5.25)
	≥4 million	1.19 (0.89–1.58)	2.93 (1.56–5.49)
Women	Age, years
(n = 2,483)	20–29	0.51 (0.31–0.85)	9.28 (2.14–40.28)
	30–39	0.78 (0.49–1.23)	2.94 (0.59–14.65)
	40–49	1.46 (0.98–2.19)	3.54 (0.73–17.17)
	50–59	1.33 (0.88–2.00)	1.44 (0.24–8.66)
	60–69	1.00 (reference)	1.00 (reference)
	Equivalent income, JPY/year
	<2 million	1.00 (reference)	1.00 (reference)
	2.00–2.99 million	0.65 (0.44–0.97)	0.75 (0.24–2.30)
	3.00–3.99 million	0.74 (0.50–1.09)	1.84 (0.73–4.64)
	≥4 million	0.81 (0.57–1.16)	1.82 (0.73–4.54)

aOR, adjusted odds ratio; CI, confidence interval; HTP, heated tobacco product.

^aAdjusted for age and equivalent income.

^bHTP smokers: smokers using only HTPs or HTPs and other tobacco products.