Table 1.

Characteristics of Study Subjects, Stratified by Primary Response to HBV Vaccination.

	Non-responders			Low-responders			Responders		p
	n	Age, years (mean±SD)		n	Age, years (mean±SD)		n	Age, years (mean±SD)
Total	29	23.5±0.66		159	22.7±0.25		502	21.1±0.12	*, **
Male	21	23.9±0.82		101	23.2±0.31		204	22.0±0.24	*, **
Female	8	22.8±1.13		58	21.7±0.39		298	20.4±0.11	**

*p<0.05, Non-responders vs. Responders; **p<0.05, Low-responders vs. Responders.

HBV: hepatitis B, SD: standard deviation