Moran’s I increased from 0.4554 to 0.6047 on a provincial scale, 0.5530–0.7048 on a prefecture scale, and 0.6680–0.7397 on a county scale, respectively, which indicates that the cluster degree of the oldest-old index exhibited an increasing trend.
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Investigation of multi-scale spatio-temporal pattern of oldest-old clusters in China on the basis of spatial scan statistics.
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