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

Table 5

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

Variable	Total number	Anti-HBs
	N	n	% (95% CI)	value
Age group
<5	4,406	2,722	62.0 (27.6–32.7)	= 3.38
5–12	4,442	2,397	54.0 (38.5–44.6)
13–24	25,229	9,506	37.7 (57.6–60.1)
≥25	172,061	61,677	36.0 (51.7–52.6)
Sex
Female	120,319	46,112	38.3 (54.1–76.3)	= 0.002
Males	85,819	30,190	35.2 (48.3–99.9)
Year
2014	20,237	7,480	37.0 (49.3–51.5)	< 0.001
2015	31,799	11,339	35.7 (53.2–54.9)
2016	41,392	14,636	35.4 (53.8–55.4)
2017	37,970	14,284	37.6 (46.5–50.1)
2018	38,165	14,423	37.8 (49.4–51.8)
2019	36,575	14,140	38.7 (49.7–52.1)
Total	206,138	76,302	37.0