Table 4.
Pearson product-moment correlation coefficients between pairwise groups of target microorganisms (OPs and total bacteria)
| Legionella | Mycobacterium | Pseudomonas | V. vermiformis | Total OPs | Total bacteria | |
|---|---|---|---|---|---|---|
| Legionella | ρ 1.000 |
ρ 0.255; p-value 0.042* |
ρ 0.643; p-value < 0.001* |
ρ 0.242; p-value 0.054 |
ρ 0.881; p-value < 0.001* |
ρ 0.779; p-value < 0.001* |
| Mycobacterium |
ρ 0.255; p-value 0.042* |
ρ 1.000 |
ρ 0.059; p-value 0.642 |
ρ 0.234; p-value 0.063 |
ρ 0.242; p-value 0.054 |
ρ 0.222; p-value 0.078 |
| Pseudomonas |
ρ 0.643; p-value < 0.001* |
ρ 0.059; p-value 0.642 |
ρ 1.000 |
ρ 0.048; p-value 0.709 |
ρ 0.829; p-value < 0.001* |
ρ 0.742; p-value < 0.001* |
| V. vermiformis |
ρ 0.242; p-value 0.054 |
ρ 0.234; p-value 0.063 |
ρ 0.048; p-value 0.709 |
ρ 1.000 |
ρ 0.224; p-value 0.075 |
ρ 0.217; p-value 0.086 |
| Total OPs |
ρ 0.881; p-value < 0.001* |
ρ 0.242; p-value 0.054 |
ρ 0.829; p-value < 0.001* |
ρ 0.224; p-value 0.075 |
ρ 1.000 |
ρ 0.809; p-value < 0.001* |
| Total bacteria |
ρ 0.779; p-value < 0.001* |
ρ 0.222; p-value 0.078 |
ρ 0.742; p-value < 0.001* |
ρ 0.217; p-value 0.086 |
ρ 0.809; p-value < 0.001* |
ρ 1.000 |
Statistical analysis: SPSS. Sample size for each pairwise comparison: 64 (i.e., 64 sampling events for the four CDWDSs). ρ: Pearson (product-moment) correlation coefficient (i.e., Pearson’s r). p-value: Two-tailed.
*:
Significant correlation (p < 0.05). Unit for the concentrations of OPs and total bacteria: log10(GCN·L−1). GCN: Gene copy number or genome copy number.