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Five-year relative survival of primary osteosarcoma by decade, based on the Surveillance, Epidemiology, and End Results (SEER) 9 database, 1975 to 2016. Five-year relative survival rates within each age group were compared by decade with 2010 to 2016 as the comparison group. Significantly different survival rates (P < .05) using the Z test are marked with (*). Number of total years per decade group varies based on available years in the SEER database.
