Factors associated with initiation and completion of the quadrivalent human papillomavirus vaccine series in an ontario cohort of grade 8 girls

Table 1 Patterns of use of the quadrivalent HPV vaccine according to program year

HPV vaccination status	2007/08 N (%)	2008/09 N (%)	Adjusted OR* (95% CI)	P-value
Series Initiation
Vaccinated	721 (54.7)	704 (58.7)	1.29 (1.08-1.53)	0.04^†
Unvaccinated	598 (45.3)	496 (41.3)
Series Completion
Completers^††	623 (86.4)	592 (84.1)	0.88 (0.65-1.20)	0.22
Non-Completers	98 (13.6)	112 (15.9)
Received 1 dose	30 (4.2)	20 (2.8)	N/A	0.03^†
Received 2 doses	68 (9.4)	92 (13.1)

OR = Odds Ratio; CI = Confidence Interval; N/A = Not Available
* Adjusted for socio-demographics, vaccination history, health services utilization, and medical history
(See Table 2 for details).
† Statistically significant (p < 0.05)
†† Includes two girls who received four doses of the vaccine.

ISSN: 1471-2458