Table 3.

Coefficients estimated in the multivariable linear regression.

	Unstandardized coefficients
Birth year	B	Std. Error	Standardized coefficients
Before 1981	Reference		Reference	T value	P value
1981–1991	0.25	0.06	0.06	3.88	<.001
1992–2001	−0.25	0.08	−0.05	−3.23	.001
Since 2002	−0.20	0.08	−0.03	−2.39	.017

Adjusted factors included gender (male or female), ethnicity (Han or non-Han), education level (primary and below, secondary or high school, college and above, or students), resident (urban or rural), and hepatitis B vaccination (yes or no).