Table 5.

Estimated cancer risk in different age groupsand different regions in Guangzhou residents.

Characteristic	Exposure (ng kg−1bwday−1)	Fraction of population with hepatitis B	Annual hepatocellular carcinoma (HCC) incidence(cancers (year 100 000people)−1)
Age group
3~6 years old	0.94(0.29~4.24)	12.45	0.0432(0.0001~1.4733)
7~17years old	0.75(0.22~3.64)		0.0346(0.0001~1.3403)
18~59years old	0.59(0.20~3.11)		0.0275(0.0001~0.8368)
More than 60 years old	0.48(0.16~1.41)		0.0221 (0.0001~0.4958)
Region
Urban	0.29(0.08~0.56)	7.10	0.0088(0.0001~0.3507)
Suburban	2.26(0.35~6.59)	16.14	0.1284(0.0001~24.422)
Total	0.57(0.21~3.16)	12.45	0.0264(0.0058~1.3802)