Table 4.

Multiple regression analyses of anticipated regret in relation to Health Belief Model variables

Outcome variable	Independent variables	B	R 2	ΔR 2	ΔF	p value
Men
Anticipated regret if unvaccinated and later developed genital warts
Step 1			<.01	<.01	.13	.72
	Have heard of HPV vaccinea	.05				.72
Step 2			.10	.09	4.78	.01
	Have heard of HPV vaccinea	−.03				.85
	Perceived severity of genital warts	.24				<.01
	Perceived benefits of HPV vaccine against genital warts	.12				.10
	Perceived risk of genital warts	.01				.90
Anticipated regret if unvaccinated and later developed HPV-related cancer
Step 1			.01	.01	.94	.34
	Have heard of HPV vaccinea	.13				.34
Step 2			.12	.11	5.66	<.01
	Have heard of HPV vaccinea	.04				.74
	Perceived severity of HPV-related cancer	.28				<.01
	Perceived benefits of HPV vaccine against HPV-related cancer	.08				.26
	Perceived risk of HPV-related cancer	.15				.10
Women
Anticipated regret if unvaccinated and later developed genital warts
Step 1			.02	.02	1.97	.17
	Have heard of HPV vaccinea	.37				.17
Step 2			.26	.23	8.09	<.01
	Have heard of HPV vaccinea	.12				.63
	Perceived severity of genital warts	.40				<.01
	Perceived benefits of HPV vaccine against genital warts	.23				.02
	Perceived risk of genital warts	.21				.08
Anticipated regret if unvaccinated and later developed HPV-related cancer
Step 1			.02	.02	1.64	.20
	Have heard of HPV vaccinea	.29				.20
Step 2			.23	.21	6.77	<.01
	Have heard of HPV vaccinea	−.21				.40
	Perceived severity of HPV-related cancer	.58				<.01
	Perceived benefits of HPV vaccine against HPV-related cancer	.25				.02
	Perceived risk of HPV-related cancer	−.01				.94

N for men = 143; Ns for women = 80–82; HPV: human papillomavirus. Statistics significant at a p < .05 are denoted in bold. Standardized beta coefficients are presented

^aHave heard of HPV vaccine was coded as 0 = no and 1 = yes