Barely Significant

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Annual Percent Change (APC) indicate the amount of increase or decrease in the percentage of change per year, which shows a decreasing trend if negative, an increasing trend if positive, and the Average Annual Percent Change (AAPC) is the average all these changes, which are calculated to describe linear trends based on each period.
In the second stage, the average efficiency value also presents an inverted “V” shaped trend, during 2011–2013, the average efficiency value shows an increasing trend, rising from 0.29 in 2011 to 0.43 in 2013, however, in just one year, the average efficiency value decreases from 0.43 in 2013 to 0.31 in 2014.
Even though the average score of the index was still in the normal range, we can ascribe such a negative trend to the attention paid by parents on their children’s behaviour during challenging cognitive activities, which could have caused a greater awareness of their children’s difficulties in terms of attentional, hyperactive and oppositional behaviour.
From the above regression results also untested: in general, the construction of urban agglomerations generally reduces the concentrations of urban air pollutants, urban air quality conditions are on a positive trend .From the results of the inclusion of control variables, the socio-economic factors of the Central Yunnan and Central Chengdu-Chongqing urban agglomerations basically show a trend towards lower urban air pollutant concentrations, Urban air quality conditions are improving. while the effect of socio-economic factors on urban air pollutant concentrations in the Central Guizhou urban agglomeration is insignificant.
From the regression results of the control variables, the socio-economic factors, the socio-economic development level has a significant effect on the urban AQI, PM10, PM2.5 and CO concentration with negative coefficients, which indicates that the socio-economic development level significantly reduces the urban PM10, PM and CO concentration, and the air quality index (AQI) has a significant trend to become better.