Table 3 Relevant factors associated with hepatitis B infection among participants according to different age groups (0–22, 23–59 and 60+ years) using multivariate logistic regression models.

Age group	Variable	Category	OR	95% CI for OR		P
Age group	Variable	Category	OR	Lower	Upper	P
0–22^†	Hepatitis B vaccination	No*	1.00
		Yes	0.10	0.04	0.24	<0.0001
23–59^‡	Hepatitis B vaccination	No*	1.00
		Yes	0.56	0.43	0.73	0.0054
	Gender	Female*	1.00
		Male	1.51	1.20	1.91	0.0045
	Education level	Illiteracy*	1.00
		Primary school	0.69	0.26	1.83	0.4563
		Middle school	1.12	0.46	2.70	0.8080
		High and vocational school	0.90	0.38	2.17	0.8190
		Undergraduate and above	0.67	0.27	1.64	0.3763
	Alcohol consumption	Never*	1.00
		Occasionally	0.62	0.41	0.93	0.0221
		Often	0.18	0.03	1.32	0.0915
		Every day	0.87	0.19	3.99	0.8593
	Physical activity frequency	Never*	1.00
		Occasionally	0.64	0.49	0.84	0.0011
		More than once per week	0.91	0.69	1.19	0.4849
		Every day	0.83	0.63	1.08	0.1684
60+^§	Hepatitis B vaccination	No*	1.00
		Yes	0.51	0.32	0.82	0.0057
	History of surgery	No*	1.00
		Yes	1.52	1.10	2.10	0.0112
	Career	Leaders of enterprise unit*	1.00
		Technical personnel	1.12	0.48	2.59	0.7941
		Handle affairs personnel	0.79	0.31	2.01	0.6237
		Commercial personnel	1.46	0.62	3.44	0.3845
		Agricultural, forestry and fishery producers	2.25	0.64	7.89	0.2051
		Transportation equipment operators	0.67	0.26	1.69	0.3951
		Others	1.59	0.77	3.27	0.2104

Odds ratio (OR) and its 95% confidence interval (95% CI) were calculated to assess the association between HBV infection and relevant factors. The statistical significance level of P < 0.05 was used.
^†Adjusted variables: gender, BMI, nationality, history of surgery, history of trauma, history of transfusion, history of having genetic disease, and drinking water.
^‡Adjusted variables: BMI, nationality, career, history of surgery, history of trauma, history of transfusion, history of having genetic disease, drinking water, stay abroad more than three months per year, cigarette and alcohol consumption frequency.
^§Adjusted variables: gender, education level, marital status, physical activity frequency, BMI, nationality, history of trauma, history of transfusion, history of having genetic disease, drinking water, stay abroad more than three months per year, cigarette and alcohol consumption frequency.
^*Reference category.

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