Table 2.

The factors identified to be associated with mean knowledge score

Factors	Mean knowledge score #		Univariate analysis		Multivariate analysis
			Mean difference (95% CI)	P Value	Unstandardized coefficients (95% CI)	P value
Grade	S5-S7	S2-S4	0.38 (0.22-0.54)	<0.01*	0.35 (0.16-0.55)	<0.01*
	3.4	3
Information from	Newspaper	No Newspaper	0.19 (0.03-0.35)	0.02*	0.28 (0.09-0.46)	<0.01*
	3.36	3.16
Information from	Internet	No Internet	0.17 (0.01-0.34)	0.04*	/	/
	3.36	3.19
Information from	Outdoor advertisement	No Outdoor advertisement	0.19 (0.03-0.34)	0.02*	/	/
	3.35	3.16
Information from	School	No School	0.41 (0.24-0.58)	<0.01*	0.49 (0.29-0.69)	<0.01*
	3.53	3.12
Cancer is a terrifying disease	Agree	Disagree			0.19 (-0.02-0.40)	0.07
	3.28	2.94	0.34 (0.10-0.59)	<0.01*
I wish to have more information on cancer prevention	Agree	disagree	0.24 (0.05-0.42)	0.01*	/	/
	3.31	3.1

#No significant difference in mean knowledge score was found for factors including parents’ working status and education level, family income, living with parents, source of information on HPV from TV, radio, magazine, hospital/clinic, relatives and friends, and agreement on the following statements: School should provide more information on cancer to enhance the knowledge of students, Hong Kong has provided adequate services in promoting prevention of cancer and If I know any ways which can prevent cancer, I am willing to change in an attempt to put them into practice.

*= P value with statistical significance.