Table 2.

The rate of anti-HBs positive in different areas.

	Anti-HBs negative		Anti-HBs positive
City	N	Frequency	N	Frequency	χ2	P
Xiangtan	337	68.20%	157	31.80%	117.458	<.001
Xiangxi	198	63.10%	116	36.90%
Chenzhou	473	59.60%	321	40.40%
Huaihua	480	59.00%	334	41.00%
Zhuzhou	479	57.60%	353	42.40%
Shaoyang	794	57.50%	586	42.50%
Yiyang	424	56.50%	327	43.50%
Changsha	927	55.70%	737	44.30%
Hengyang	827	55.40%	667	44.60%
Yueyang	574	54.40%	481	45.60%
Loudi	477	54.30%	401	45.70%
Zhangjiajie	189	51.20%	180	48.80%
Changde	779	48.50%	828	51.50%
Yongzhou	460	46.90%	520	53.10%

anti-HBs = anti-hepatitis B surface antibodies.