Table 1. Correlations analysis of sAUDPS indexes in different environments.

Environment	Mean	Range	CV (%)	Correlation coefficient
				2015 Yangzhou	2016 Yangzhou	2020 Yangzhou	2019 Yancheng	2020 Yancheng
2015 Yangzhou	0.85	0.00–2.30	74.14
2016 Yangzhou	1.09	0.00–1.84	51.93	0.86** P = 2.8384E−53
2020 Yangzhou	0.83	0.00–3.02	97.54	0.74** P = 5.8099E−33	0.65** P = 2.2727E−23
2019 Yancheng	1.23	0.00–2.93	59.73	0.76** P = 2.1563E−35	0.71** P = 2.7978E−29	0.62** P = 2.9198E−20
2020 Yancheng	1.29	0.00–2.73	62.19	0.80** P = 8.0229E−41	0.72** P = 4.9833E−30	0.68** P = 1.0375E−25	0.82** P = 4.0418E−45

Note:

^**Represent significant correlation at 0.01 levels (p < 0.01).