| Nigerian Standard Guideline Value | 1.0 × 10−2 |
| 3.0 × 103 | 5.0 × 10−2 | 1 | 3.0 × 10−1 | 2.0 × 10−1 | 2.0 × 10−2 | 1.0 × 10−2 | 3 |
|
| 6.5 - 8.5 | 500 |
| Minimum | 0 | 1.9 × 10−4 | 0 | 2.0 × 10−3 | 7.0 × 10−4 | 9.0 × 10−3 | 1.2 × 10−3 | 1.0 × 10−3 | 0 | 6.6 × 10−3 | 22.6 | 160 | 6 | 102 |
| Maximum | 1.1 × 10−3 | 3.58 × 10−3 | 9.0 × 10−4 | 1.52 × 10−2 | 8.17 × 10−2 | 2.339 | 1.68 × 10−1 | 7.7 × 10−3 | 1.27 × 10−2 | 4.39 × 10−1 | 31.9 | 840 | 8.7 | 538 |
| Mean | 0 | 1.02 × 103 | 0 | 3.8 × 10−2 | 1.33 × 10−3 | 3.39 × 10−1 | 3.51 × 10−2 | 2.6 × 10−3 | 2.0 × 10−3 | 5.18 × 10−2 | 25.9 | 372.2 | 6.7 | 235.5 |
| Standard Deviation | 2.0 × 10−4 | 1.0 × 103 | 0 | 2.7 × 10−3 | 2.23 × 10−2 | 5.15 × 10−1 | 3.66 × 10−2 | 1.8 × 10−3 | 2.7 × 10−3 | 9.18 × 10−2 | 2.31 | 207.8 | 0.64 | 133.8 |