Table 2. Geometric Mean Titer (GMT) of Human Papillomavirus (HPV)–Specific Antibodies at Enrollment Depending on Disease Duration.

Time from RRP diagnosis, y	No.	GMT of specific antibodies
		HPV-6 antibodies	HPV-11 antibodies
≤1	21	16.7	4.3
2-4	11	46.2	14.2
>4	18	74.1	13.7

Abbreviation: RRP, recurrent respiratory papillomatosis.