Appendix Table D.

Multinomial model: predictors of HPV vaccination (no vaccination reference response)

	Received HPV Vaccination		Don’t Know/Not Sure
Variable	OR [95% CI]	p-value	OR [95% CI]	p-value
Age (≤22 ref)
Age >22	0.82 [0.56, 1.21]	0.3110	0.42 [0.29, 0.60]	<0.0001
Race (White ref)
Black/African American	1.67 [1.09, 2.56]	0.0192	1.17 [0.78, 1.76]	0.4413
Other	0.91 [0.48, 1.75]	0.7856	0.98 [0.55, 1.74]	0.9441
Received provider recommendation for HPV vaccine – No (ref)
Yes	4.23 [2.88, 6.21]	<0.0001	0.63 [0.43, 0.92]	0.0176
Not sure	0.16 [0.06, 0.41]	0.0002	0.16 [0.08, 0.33]	<0.0001
Received parent recommendation for HPV vaccine – No (ref)
Yes	15.75 [9.97, 24.90]	<0.0001	2.95 [1.73, 5.02]	0.0001
Not sure	9.37 [5.18, 16.96]	<0.0001	13.86 [8.05, 23.86]	<0.0001
Have a Primary Care Provider (PCP) – No ref
Yes	0.98 [0.68, 1.42]	0.9344	1.17 [0.84, 1.62]	0.3574
Frequency of visits to PCP – <1/year (ref)
1 per year	1.07 [0.64, 1.79]	0.7977	1.05 [0.67, 1.65]	0.8384
2–3 per year	1.39 [0.88, 2.20]	0.1617	0.81 [0.54, 1.22]	0.3099
4+ per year	0.96 [0.49, 1.88]	0.9108	0.51 [0.26, 0.98]	0.0446
Received Flu Vaccination – No ref
Yes	1.22 [0.86, 1.74]	0.2593	1.16 [0.85, 1.59]	0.3588
Influence of doctor encouragement on getting HPV vaccine – No change/Less likely (ref)
More likely	2.13 [1.39, 3.27]	0.0005	2.51 [1.73, 3.64]	<0.0001
Many of my friends have received the HPV vaccination – Disagree (ref)
Agree	1.99 [1.00, 3.96]	0.0490	0.34 [0.15, 0.76]	0.0090
Don’t know/Not sure	1.68 [0.96, 2.94]	0.0716	1.98 [1.26, 3.11]	0.0032
It is important to me that my partner has received the HPV vaccine – Disagree (ref)
Agree	2.59 [1.65, 4.08]	<0.0001	1.30 [0.82, 2.04]	0.2623
Don’t know/Not sure	1.23 [0.81, 1.88]	0.3332	1.05 [0.73, 1.50]	0.8069
HPV vaccine is so new that I want to wait a while before receiving it – Neutral (ref)
Agree	0.21 [0.11, 0.39]	<0.0001	0.72 [0.48, 1.09]	0.1182
Disagree	1.91 [1.28, 2.83]	0.0014	0.63 [0.43, 0.91]	0.0133