Hepatitis B infection among adults in the philippines: A national seroprevalence study

Table 1 Prevalence of hepatitis B surface antigen positivity according to demographic characteristics n (%)

	HBsAg positive	95%CI	P value
All adults	2150 (16.7)	14.3-19.1
Sex			0.555
Females	1194 (16.0)	13.0-18.9
Males	956 (17.5)	14.1-20.8
Marital status1			0.177
Never married	261 (19.3)	13.6-25.0
Otherwise	1883 (16.0)	13.5-18.4
Educational attainment1			0.021
High school	1412 (18.6)	15.5-21.7
At least some tertiary	720 (14.6)	11.3-18.0
Employment status			0.189
Unemployed	1077 (15.4)	12.0-18.8
Employed	1073 (17.5)	14.4-20.7
Income1			0.003
Q1	484 (20.6)	13.2-18.4
Q2	564 (19.2)	14.6-23.8
Q3	566 (16.8)	12.1-21.5
Q4	502 (11.3)	7.0-15.6

¹Missing data. HBsAg: Hepatitis B surface antigen.

Table 2 Prevalence of hepatitis B surface antigen seropositivity and population estimates according to age group and gender n (%)

Age group	Total			Males			Females
		95%CI	Estimated number		95%CI	Estimated number		95%CI	Estimated number
20-29	329 (18.1)	13.6-22.6	2580340	170 (19.5)	13.1-25.9	1392647	159 (16.6)	10.5-22.8	1187693
30-39	314 (17.6)	13.2-22.0	1960314	163 (20.2)	13.6-26.8	1137688	151 (14.9)	9.0-20.7	822626
40-49	252 (16.0)	11.2-20.9	1314240	112 (13.4)	7.2-19.7	567308	140 (18.2)	11.4-25.1	746932
50-59	162 (14.3)	9.0-19.5	715781	66 (10.1)	3.2-16.9	265155	96 (17.2)	9.3-25.0	450626
60-69	638 (14.3)	11.4-17.2	443882	267 (17.6)	12.7-22.6	254760	371 (11.9)	8.3-15.5	189122
70 and over	455 (13.6)	10.0-17.3	264411	178 (12.4)	8.1-16.8	104217	277 (14.4)	9.5-19.2	160194

Table 3 Relative odds of hepatitis B surface antigen positivity among adults by selected demographic variables

	Adjusted OR	95%CI
Sex
Females	1.00
Males	1.06	0.76-1.45
Marital status
Never married	1.00
Otherwise	0.75	0.48-1.16
Educational attainment
High school	1.00
At least some tertiary	0.78	0.55-1.13
Employment status
Unemployed	1.00
Employed	1.18	0.85-1.71
Income
Q1	1.00	-
Q2	0.94	0.59-1.50
Q3	0.82	0.51-1.31
Q4	0.51	0.30-0.86