The age-specific incidence among females generally increased with age, reaching a peak of 48.5/100,000 during 2015–2019 in the 50–54 age group, then rapidly decreased with age, thereafter, resulting in an overall trend resembling an inverted “V” shape.
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Tumor size and clinical staging data at the time of diagnosis also showed a trend toward earlier diagnosis; thyroid cancer patients diagnosed during 1993–1998 were diagnosed earlier than those diagnosed during 1979–1992 [ 38 ].