5 , excluding the years 2020 and 2021 affected by COVID-19, the contribution rate of intra-group differences in the remaining years showed a decreasing trend, that is, from 37.64 % to 13.20 %, with an average contribution rate of 28.71 %, while the contribution rate of inter-group differences showed a positive “U" shape bounded by 2015.
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Spatial difference analysis and dynamic evolution prediction of urban industrial integrated water use efficiency in China.
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The sentences
However, in 2020 and 2021 after the impact of COVID-19, the contribution rate of intra-group differences showed a decreasing trend from 22.73 % to 12.69 %, while the contribution rate of inter-group differences showed an increasing trend from 39.32 % to 70.84 %, which further proved that inter-group differences were the main source of overall differences in industrial comprehensive water use efficiency.
Distribution position In the whole country, the nuclear density curve of industrial comprehensive water use efficiency shows an overall trend to the left, mainly concentrated around 0.2, which means that the industrial comprehensive water use efficiency of most cities at or above the prefecture level in China is low.