(2) From 2000 to 2020, the growth rate of weight was higher than that of height, and BMI showed an increasing trend.
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Trends and predictions in the physical shape of Chinese preschool children from 2000 to 2020.
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The sentences
The value of the development coefficient of the model parameter “a” reflects the intrinsic development trend of the time series data; if “a” is “negative,” it means the increasing trend of the series, if “a” is “positive,” it indicates a decreasing trend.