In 2011 and 2015, TC levels of middle-aged and elderly population in rural and urban areas showed a trend of aggregation, and Moran index showed that the aggregation was increasing.
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Associations of environmental factors with total cholesterol level of middle-aged and elderly people in China.
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The sentences
In the past 5 years, the TC level of the middle-aged and elderly showed a decreasing trend in all regions.
Urban areas had many sources of complex types of pollutants other than in rural areas, such as excessive car exhaust and plant emissions, so some of the pollutant effects may not be significant.