Table 3.

Adjusted hazard ratios (HR) for HPV vaccine initiation in childhood and adolescent and young adult (AYA) cancer survivors by sex

	Female n = 428		Male n = 451
	HR	95% CI	p value	HR	95% CI	p value
Age category at eligibility (years)
11–17	4.71	2.05, 10.84	0.0003	9.18	2.56, 32.86	0.0007
18–26	1.00 (ref)			1.00 (ref)
Age at cancer diagnosis (years)
≤10	3.10	1.12, 8.60	0.0300	3.99	1.02, 15.63	0.0468
11–14	1.80	0.67, 4.86	0.24	2.27	0.56, 9.11	0.25
≥15	1.00 (ref)			1.00 (ref)
Time from cancer diagnosis to eligibility to receive HPV vaccination (years)	0.95	0.90, 1.00	0.07	0.92	0.86, 0.99	0.03
Relapse
Yes	1.25	0.67, 2.33	0.49	0.71	0.25, 2.03	0.52
Cancer diagnosis
Leukemia/lymphoma	0.84	0.57, 1.24	0.38	0.90	0.53, 1.53	0.70
Other cancera	1.00 (ref)			1.00 (ref)
Race/ethnicity
Non-Hispanic/White	0.82	0.53, 1.27	0.38	0.83	0.47, 1.47	0.53
Otherb	1.00 (ref)			1.00 (ref)
Receipt of hematopoietic stem cell transplantation (HSCT)c
Yes	0.70	0.30, 1.64	0.41	0.59	0.14, 2.54	0.48

^aSolid tumor, thyroid cancer, melanoma, other cancer

^bBlack, Asian, Hispanic, other/unknown

^cPrior to eligibility to receive HPV vaccination