Table 4.

The frequency of HBV reactivation for 4 years according to the positivity of HBs/HBc antibody in RA patients with resolved infection

	HBc Ab (+)/HBs Ab (+)	HBc Ab (+)/HBs Ab (−)	HBc Ab (−)/HBs Ab (+)	Total
Number	787	218	112	1127
Reactivated cases	32 (4.07%)	24 (11.01%)	1 (0.81%)	57 (5.05%)
Cases with HBV DNA ≥ 2.1 log copies/mL	6 (0.76%)	8 (3.67%)	1 (0.81%)	15 (1.33%)

Abbreviations: HBV DNA hepatitis B virus DNA, HBs Ab anti-hepatitis B virus surface antibody, HBc Ab anti-hepatitis B virus core antibody