Hepatitis B Virus Immunity Gap: A Six-Year Laboratory Data Review of Hepatitis B Serological Profiles in Gauteng Province, South Africa

Table 4

The distribution of positive anti-HBc IgM per year across all age groups and sex in Gauteng Province, 2014–2019.

Variable	Total number	Anti-HBc IgM
	N	n	% (95% CI)	value
Age group
<5	3,154	23	0.7 (2.1–4.3)	= 0.002
5–12	2,788	23	0.8 (2.1–4.2)
13–24	25,200	865	3.4 (26.2–27.2)
≥25	208,095	4,750	2.3 (42.3–55.6)
Sex
Female	137,061	2,719	2.0 (66.1–81.3)	= 0.364
Males	102,176	2,942	3.0 (69.1–87.5)
Year
2014	16,491	718	4.4 (18.0–19.7)	= 0.05
2015	39,227	1,036	2.6 (13.8-14.9)
2016	52,195	1,293	2.5 (10.7–11.7)
2017	56,804	1,082	2.0 (11.2–12.8)
2018	42,316	880	2.1 (10.7–12.3)
2019	32,204	652	2.0 (11.6–13.2)
Total	239,237	5,661	2.4