| Table E: Sampling frequency influence | ||||||
| Variation between weekly and 4-weekly sampling | ||||||
| Dose | Dose | |||||
| Underestimate | Overestimate | |||||
| Sample | Average [U] (ug/L) | Min deviation | Max deviation | Ph1/Ph2 [U] Ratio | Inverse Min | |
| 38 | 9.31 | 0.04 | 2.63 | 0.90 | 23.69 | |
| 28 | 1.26 | 0.32 | 3.59 | 0.90 | 3.11 | |
| 33 | 1.06 | 0.38 | 2.55 | 0.90 | 2.66 | |
| 15 | 114.00 | 0.46 | 1.31 | 0.90 | 2.17 | |
| 22 | 5.06 | 0.49 | 1.58 | 0.90 | 2.04 | |
| 13 | 18.78 | 0.50 | 2.27 | 0.90 | 2.02 | |
| 29 | 0.94 | 0.50 | 1.77 | 1.42 | 2.00 | |
| 18 | 3.99 | 0.53 | 1.39 | 0.90 | 1.90 | |
| 34 | 0.78 | 0.55 | 2.41 | 1.40 | 1.81 | |
| 37 | 48.33 | 0.57 | 1.35 | 1.24 | 1.76 | |
| 32 | 0.96 | 0.59 | 2.18 | 0.90 | 1.71 | |
| 14 | 2.88 | 0.62 | 1.76 | 0.42 | 1.61 | |
| 11 | 84.07 | 0.63 | 1.59 | 0.90 | 1.58 | |
| 26 | 0.63 | 0.64 | 2.37 | 0.90 | 1.55 | |
| 27 | 0.92 | 0.64 | 1.74 | 0.85 | 1.55 | |
| 7 | 128.56 | 0.66 | 1.24 | 0.69 | 1.51 | |
| 25 | 0.62 | 0.67 | 2.56 | 0.90 | 1.49 | |
| 16 | 21.01 | 0.69 | 2.38 | 0.68 | 1.44 | |
| 36 | 12.80 | 0.71 | 1.73 | 2.29 | 1.41 | |
| 23 | 18.91 | 0.73 | 1.21 | 0.94 | 1.37 | |
| 30 | 0.53 | 0.74 | 1.44 | 0.94 | 1.34 | |
| 6 | a | 3.19 | 0.75 | 1.25 | 0.90 | 1.33 | 
| 10 | 23.24 | 0.75 | 1.26 | 0.90 | 1.32 | |
| 39 | 22.01 | 0.77 | 1.40 | 0.90 | 1.30 | |
| 8 | 58.77 | 0.77 | 1.36 | 0.90 | 1.30 | |
| 24 | 0.52 | 0.79 | 1.52 | 0.90 | 1.26 | |
| 35 | 1.55 | 0.81 | 1.30 | 2.02 | 1.23 | |
| 7 | a | 214.71 | 0.84 | 1.22 | 0.87 | 1.18 | 
| 20 | 0.57 | 0.85 | 1.23 | 0.90 | 1.18 | |
| 6 | 3.14 | 0.85 | 1.19 | 0.62 | 1.17 | |
| 5 | 31.38 | 0.85 | 1.18 | 0.87 | 1.17 | |
| 12 | 243.42 | 0.88 | 1.36 | 0.35 | 1.13 | |
| 2 | 20.50 | 0.88 | 1.23 | 0.90 | 1.13 | |
| 3 | 36.18 | 0.91 | 1.06 | 0.93 | 1.10 | |
| 21 | 7.33 | 0.91 | 1.16 | 0.90 | 1.10 | |
| 1 | 156.54 | 0.93 | 1.09 | 0.90 | 1.07 | |
| 31 | 0.42 | 0.94 | 1.13 | 0.90 | 1.07 | |
| 19 | 2.96 | 0.94 | 1.19 | 0.90 | 1.06 | |
| 9 | 73.39 | 0.95 | 1.05 | 0.90 | 1.05 | |
| 17 | 48.85 | 0.99 | 1.60 | 0.90 | 1.01 | |
| 4 | 38.28 | 0.99 | 1.02 | 0.90 | 1.01 | |
| * Data printed in bold are measured, others are estimated from the "global" mean | ||||||