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Spatial and temporal distribution of CH (the number of centenarians per one hundred thousand inhabitants), UOOUS (ultra-octogenarian of the ultra-sexagenarian; the ratio of the population above 80 years of age over the elderly population above 60 years of age), UOI (ultra-octogenarian index; the percentage of the population aged at least 80 years) and LE (the life expectancy at birth) in Hechi city at county level (1982–2010).
