Fig 2.
Shown are male-female incidence rate ratios (RRs) for oropharynx cancers, stratified by age in rows (5-year groups) and calendar periods in columns (5-year groups). The diagonals across the age groups and calendar years represent birth cohorts. The scale for the color-coded RRs is also shown on the right. Data were derived from nine cancer registries covered by the National Cancer Institute's SEER program (1973 to 2011). Oropharyngeal cancers include the base of tongue, lingual tonsil, soft palate, uvula, tonsil, oropharynx, and Waldeyer's ring. HPV, human papillomavirus.