Sample No. | Site I | Site II | Site III | WHO standards |
1 | 8.161 | 8.189 | 8.327 | |
2 | 8.057 | 8.42 | 8.37 | |
3 | 7.891 | 7.83 | 8.365 | |
4 | 8.025 | 8.135 | 8.401 | 6.5 to 9.5 |
5 | 7.68 | 8.126 | 8.192 | |
Average (Y) and standard deviation | 7.962 ± 0.185 | 8.140 ± 0.210 | 8.331 ± 0.082 |