Table 5.

Multi-variate analysis on factors associated with initiation of HPV vaccination (N = Total numbers of returned questionnaires with valid data of that particular variable)

Factors	Odds ratios (95% CI)	P value
Mother education (N = 905)
Primary or below	1
Secondary	0.61 (0.2, 1.87)	0.38
Post-secondary	1.66 (0.61, 4.55)	0.32
Income (N = 785)
HK$9999 or below	1
HK$10 000 - $14 999	0.68 (0.26, 1.79)	0.43
HK$15 000 - $29 999	0.87 (0.37, 2.01)	0.74
HK$30 000 or above	0.87 (0.36, 2.1)	0.76
Reasonable cost for vaccine (N = 1033)
Not important	1
Important	0.676 (0.29, 1.60)	0.37
Comments from relatives and close friend
(N = 1.033)	1
Not important Important	1.9 (1.04, 3.49)	0.04*
School should provide more information for students on cancer prevention (N = 1407)
Disagree	1
Agree	4.35 (1.09, 17.3)	0.04*
Cancer is a terrifying disease (N = 1409)
Agree	1
Disagree	0.1 (0.016, 0.63)	0.01*
Understanding of cervical cancer (6 questions, Additional file 1 ) (N = 1343)
Answering correctly 2 questions or less	1
Answering correctly 3 questions or more	1.11 (0.56, 2.17)	0.77

* = P value with statistical significance.