Table 2.

Logit regression results on the relationship between adolescent tobacco use types and the occurrence of sexual behavior, South Korea (2018–2022) (N=207964)

Variables	Sexual behavior AOR (95% CI)
	Model 1	Model 2	Model 3	Model 4
Ordinary cigarette	7.85 (7.49–8.23)***			4.20 (3.94–4.48)***
Liquid e-cigarettes with nicotine		8.21 (7.80–8.64)***		2.02 (1.87–2.18)***
Cigarette type e-cigarette			9.86 (9.26–10.49)***	2.17 (2.01–2.34)***
Gender	1.26 (1.19–1.34)***	1.30 (1.22–1.37)***	1.46 (1.38–1.54)***	1.17 (1.10–1.24)***
Age (years)	1.15 (1.09–1.20)***	1.15 (1.10–1.21)***	1.15 (1.10–1.21)***	1.14 (1.09–1.19)***
Economic situation	1.09 (1.06–1.12)***	1.08 (1.05–1.10)***	1.07 (1.05–1.10)***	1.07 (1.04–1.10)***
Academic achievement	0.920 (0.902–0.939)***	0.903 (0.885–0.921)***	0.879 (0.862–0.897)***	0.941 (0.923–0.960)***
Grade	1.18 (1.12–1.25)***	1.22 (1.16–1.29)***	1.24 (1.17–1.30)***	1.19 (1.13–1.25)***
Father’s education level	0.933 (0.898–0.970)***	0.923 (0.888–0.960)***	0.912 (0.877–0.948)***	0.938 (0.902–0.976)***
Mother’s education level	0.928 (0.892–0.965)***	0.920 (0.884–0.956)***	0.907 (0.872–0.943)***	0.928 (0.892–0.966)***
Educational stage	1.12 (1.02–1.24)**	1.07 (0.973–1.18)	1.08 (0.979–1.18)	1.07 (0.970–1.18)
School type	1.07 (1.02–1.12)***	1.07 (1.02–1.12)***	1.08 (1.03–1.13)***	1.07 (1.02–1.12)***
City scale	1.14 (1.04–1.24)***	1.14 (1.04–1.25)***	1.10 (1.01–1.20)**	1.12 (1.03–1.23)**
Year FE	Yes	Yes	Yes	Yes
City FE	Yes	Yes	Yes	Yes
pseudo R2	0.170	0.156	0.138	0.187

AOR: adjusted odds ratio. Models 1 to 3 sequentially display the relationships between various types of tobacco use (ordinary cigarette, liquid e-cigarettes with nicotine, and cigarette type e-cigarette) and the occurrence of sexual behavior. Model 4 includes all three types of tobacco in the analysis. In each model, the covariates are presented, and both time and city fixed effects are included.

^**p<0.05,

^***p<0.01.