Table 2. Hepatitis B knowledge by subject characteristics.

Demographic variable		Number	Knowledge score ($\overline{X}\pm S$)	F value	P value
Gender	Male	507	11.62±3.28	1.598	0.207
	Female	255	11.29±3.42
Age	≤30a	227	12.22±3.20	13.703	<0.001
	30-40a	210	12.09±2.74
	41-50b	181	10.83±3.46
	≥51b	164	10.51±3.65
Education	Primary school and belowa	67	8.27±3.99	46.815	<0.001
	Junior middle/special Secondary/high school educationb	335	10.87±3.19
	Junior collegec	140	12.44±2.64
	Bachelor degree or abovec	214	12.84±2.87
Province	Beijinga	197	11.45±3.32	5.867	0.001
	Henanb	197	12.12±2.99
	Guangdongb	198	11.63±3.39
	Shaanxia	200	10.75±3.54

Note: Superscripted letters indicate that the difference between two items is statistically significant unless the letters are the same.