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Table 6

Water quality indexes of Cau River

SeasonWQI score (n= 22)
Entire riverUpstreamMidstreamDownstreamP value
Dry season Average 67.52 83.31 61.10 61.85 0.018** 
SD 16.96 7.49 21.22 11.04 
Rainy season Average 69.67 66.36 81.23 62.89 0.000005*** 
SD 9.89 5.17 5.16 5.70 
Season difference P value 0.598 0.001*** 0.031** 0.805  
SeasonWQI score (n= 22)
Entire riverUpstreamMidstreamDownstreamP value
Dry season Average 67.52 83.31 61.10 61.85 0.018** 
SD 16.96 7.49 21.22 11.04 
Rainy season Average 69.67 66.36 81.23 62.89 0.000005*** 
SD 9.89 5.17 5.16 5.70 
Season difference P value 0.598 0.001*** 0.031** 0.805  

SD (standard deviation); (*), (**), (***) indicates level of significance at P-value is 0.1; 0.05 and 0.01.

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