Bacteriological and Physicochemical Quality of Drinking Water in Wegeda Town, Northwest Ethiopia
Table 2
Comparison of median count (n = 15), ranges, and mean rank of total and fecal coliform bacteria (MPN/ml) in the different water sources and households’ container in Wegeda town, 2018/19.
Bacteria
Samples
Median (SE)
Range
Mean rank
Mann–Whitney U test
value (asymp. sign)
TC
TW
5.00 (1.25)
2–13
9.97
29.5
0.001
TW-H
13.00 (1.82)
6–26
21.03
HDW
5.00 (1.77)
2–21
10.70
40.5
0.003
HDW-H
13.00 (3.62)
6–46
20.30
PS
11.00 (2.26)
2–33
12.17
62.50
0.038
PS-H
17.00 (4.22)
4–52
18.83
UPS
11.00 (3.48)
4–39
10.77
41.5
0.003
UPS_H
27.00 (8.61)
11–110
20.23
FC
TW
2.00 (0.74)
2–7
10.5
37.5
0.002
TW-H
7.00 (1.34)
2–17
20.5
HDW
5.00 (0.90)
2–11
10.77
41.5
0.002
HDW-H
9.00 (1.63)
5–21
20.33
PS
4.00 (0.84)
2–11
10.90
43.5
0.003
PS-H
7.00 (1.56)
4–21
20.10
UPS
6.00 (1.44)
2–15
11.13
47
0.006
UPS_H
13.00 (3.20)
4–39
19.87
Note: standard error of the median. TC = total coliform count; FC = fecal coliform count; sample codes are as indicated in Table 1.
