a negative trendP < 0.05
a positive trendP < 0.05
In addition, the relationships between the PC s and the total PAs indicated that PC 1 exhibited a negative trend (r = −0.064, P < 0.05), whereas PC 2 exhibited a positive trend (r = 0.063, P < 0.05) with respect to the frequency of the total PA. 3.2.