Table 1.

Constructs and corresponding items in the model.

Constructs	Items	Measures
Information	I1	Have you ever heard of HPV?
	I2	Have you ever heard of HPV-related diseases?
	I3	Using condom can reduce HPV infection
	I4	Both men and women can be infected with HPV
	I5	HPV can cause genital warts and malignant tumors such as cervical/penile/skin cancers
	I6	HPV is mainly transmitted through sexual contact
	I7	Most HPV infection have no visible symptoms
	I8	Have you ever heard of the HPV preventive vaccine?
	I9	HPV vaccine can effectively prevent cervical/anal cancer/genital warts.
	I10	What is the best time to be vaccinated against HPV?
	I11	Who can be vaccinated against HPV?
	I12	Does the HPV vaccine protect against all types of HPV infection?
Motivation	M1	How likely do you think you are to be infected with HPV?
	M2	How much of a threat do you think HPV is to you?
Behavioral skills	BS1	Have you ever been tested for sexually transmitted diseases?
	BS2	Have you ever initiated counseling on sexually transmitted diseases?
	BS3	Have you ever been tested for HIV?
	BS4	Have you ever initiated HIV counseling?
Risky sexual behavior	RSB1	In the last six months, number of male sexual partners (casual and regular):
	RSB2	In the last six months, Unprotected sex with men:

I, information; M, motivation; BS, Behavioral skills; RSB, Risky sexual behavior.