Figure 2. Trends in Annual Incidence Rates of Oropharyngeal Cancer According to Race and Ethnicity and Age at Diagnosis Among Men and Women.

Data markers represent the observed incidence rates (cases per 100 000 person-years) of oropharyngeal cancer. The slope of the lines represents the annual percent change (APC). Panels A and B show incidence trends according to race/ethnicity in men and women, respectively. Panels C and D show incidence trends according to age at diagnosis in men and women, respectively. Data were taken from the National Program of Cancer Registries and Surveillance Epidemiology and End Results program. Rates were calculated as number of cases per 100 000 person-years and age-adjusted to the 2000 US standard population. Abbreviations: APC, annual percentage change; AAPC, average annual percentage change.

^aIndicates statistically significant incidence trend (P < .05).