Table 4. Statistical analysis of EAC spike in DWTP samples.
Statistical analysis of exogenic amplification control (EAC) spike in DWTP samples using Kruskal-Wallis and Dunn’s test. Significant differences indicate that DWTP samples did not perform similarly to pristine samples when both were spiked with EAC.
| Dilutiona | Average ± Std.Dev. (CV)b | Kruskal-Wallisc | Dunn’sc EAC Control vs. Source | Dunn’sc EAC Control vs. Treated | Dunn’sc Source vs. Treated | ||
|---|---|---|---|---|---|---|---|
|
| |||||||
| Pristine Control | Source | Treated | |||||
| undiluted | 5.00±0.00 (0) |
0.00±0.00 (0) |
1.00±1.65 (165) |
<0.0001 | <0.05 | <0.05 | NS |
| 1 to 5 | 8.65±1.69 (19) |
3.52±3.79 (108) |
8.91±1.22 (14) |
<0.0001 | <0.05 | NSd | <0.05 |
| 1 to 10 | 5.55±2.59 (47) |
3.08±3.05 (99) |
6.92±2.94 (42) |
0.0014 | <0.05 | NSd | <0.05 |
a
The number of PCR reactions per dilution was 5, 10, and 10 for undiluted, 1 to 5 and 1 to 10
b
Averages represent average number of PCR-positives. CV is the percent coefficient of variation
c
p-values are shown below the Kruskal-Wallis and Dunn’s test columns
d
NS refers to non-significance