As a sensitivity analysis, age categories were classified in 10-year increments beginning at age 20, with a decreasing trend in AAPC for 50–59- and 60–69-year groups and no change in AAPC for those aged 70 and older. 4.
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Trends in Head and Neck Cancer Mortality from 1999 to 2019 in Japan: An Observational Analysis.
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Kawakita et al., reported that among HNCs in Japan, oral cavity, salivary gland, and oropharyngeal cancers showed an increasing trend in both men and women between 1993 and 2015 [ 14 ].