Table 4.

Multiple linear regression on the influence of independent variables on the anti-HBs titer (logarithmic transformation) in all students and in two cohorts of those vaccinated before or after the first year of age. Significant results are in bold.

All Students	b	r	t	p
Intercept	101.326457		23.188326	<0.0001
year of birth	−0.049739	−0.208528	−22.548445	<0.0001
sex	0.031555	0.017194	1.818617	=0.069
time	−0.000152	−0.228768	−24.852321	<0.0001
Vaccinated before 1 year of age	b	r	t	p
Intercept	−34.537893		−3.868822	<0.0001
year of birth	0.017517	0.050819	3.944496	<0.0001
sex	−0.035231	−0.019884	−1.541681	=0.1232
time	0.000086	0.036904	2.862629	=0.0042
Vaccinated after 1 year of age	b	r	t	p
Intercept	110.800937		13.20865	<0.0001
year of birth	−0.054679	−0.17756	−12.974467	<0.0001
sex	0.148749	0.079279	5.718946	<0.0001
time	−0.000075	−0.092701	−6.694957	<0.0001