Table 1.
Pearson's correlation coefficient of the S. aureus strains on the different materials (Dacron or polystyrene) for ATP vs. CFU, ATP vs. Cry, and CFU vs. Cry.
| Assay | Material | Time | Correlation | Organism |
|---|---|---|---|---|
| ATP vs. CFU | Dacron | 4 h | Strong | BEB-029 |
| Moderate strong | BEB-295 | |||
| 18 h | Very weak | All three strains | ||
| ATP vs. CFU | PTFE | 4 h | Negative correlations | All three strains |
| 18 h | Negative correlations | All three strains | ||
| ATP vs. CFU | PS | 4 h | Very strong | BEB-029 |
| 18 h | Moderate strong | SH1000 | ||
| ATP vs. Cry | PS | 4 h | Strong | BEB-295 |
| Moderate strong | BEB-029 | |||
| 18 h | Very strong | BEB-029 | ||
| Strong | BEB-295, SH1000 | |||
| Cry vs. CFU | PS | 4 h | Strong | BEB-029 |
| Weak | BEB-295 | |||
| 18 h | Weak | BEB-029, SH1000 |
The following interpretation of the correlation coefficient and the strength of relationship was applied: 0.01–0.2: very weak, 0.21–0.4 weak, 0.41–0.6 moderately strong, 0.61–0.8 strong, 0.81–1 very strong. There were no significant positive correlations between the results of the ATP vs. CFU assay on PTFE surfaces. Listed are the highest positive correlations for the time point and material used. A detailed list of all Pearson's correlation coefficient and coefficient of determination of quantification is given in the supplementary material (Table S1).