Figure. Mean, Minimum, and Maximum Ages at Diagnosis of Human Papillomavirus (HPV)-Positive and HPV-Negative Oropharyngeal Squamous Cell Carcinoma.

Ages by calendar year from 2002 to 2017 in HPV-positive (A) and HPV-negative (B) patients. The years before 2005 were excluded for HPV-negative analysis because there were only 2 cases between 2002 and 2004.

^aP < .05 for regression analysis.