Table 3. HPV vaccination status among medical students grouped according to four categories of retrospective influence on vaccine use (N= 379).

Categories	Groups	Vaccination		Odds ratio		Fisher’s exact test
		No	Yes	Value	95% CI
Parental advice	Yes	36	39	6.95	3.97-12.16	<.0001
	No	263	41
Sex	Female	101	60	5.88	3.36-10.30	<.0001
	Male	198	20
Sexual initiation	< 16 years	40	4	.33	.11-.95	.0317
	Later or none	250	76
Age range	<24 years old	228	69	1.95	.98-3.89	.0659
	≥24 years old	71	11