Table 1.
Comparison of biofilm growth (as measured by crystal violet absorbance) at varying glucose concentrations in the two bacterial strains
| Glucose concentration (mg/dL) | Crystal violet absorbance* | |||
|---|---|---|---|---|
| Staphylococcus epidermidis | Tukey grouping (p < 0.05) | Staphylococcus aureus | Tukey grouping (p < 0.05) | |
| 0 | 1.6 (1.55–1.75) | A | 0.19 (0.14–0.24) | A |
| 20 | 2.19 (1.99–2.39) | B | 0.18 (0.13–0.23) | A |
| 40 | 2.35 (2.15–2.55) | BC | 0.18 (0.14–0.24) | A |
| 60 | 2.35 (2.15–2.55) | BC | 0.21 (0.16–0.26) | A |
| 80 | 2.60 (2.15–2.55) | BC | 0.24 (0.19–0.29) | A |
| 100 | 2.39 (2.19–2.59) | BC | 0.20 (0.16–0.26) | A |
| 120 | 2.49 (2.26–2.69) | BC | 0.19 (0.14–0.24) | A |
| 140 | 2.47 (2.26–2.67) | BC | 0.18 (0.12–0.23) | A |
| 160 | 2.38 (2.18–2.58) | BC | 0.19 (0.14–0.24) | A |
| 180 | 2.54 (2.34–2.74) | BCD | 0.21 (0.17–0.27) | A |
| 200 | 3.01 (2.81–3.21) | D | 0.23 (0.19–0.29) | A |
| 220 | 2.61 (2.41–2.81) | BCD | 0.57 (0.51–0.62) | B |
| 240 | 2.85 (2.65–3.05) | CD | 0.68 (0.63–0.73) | B C |
| 260 | 2.93 (2.72–3.13) | D | 0.76 (0.70–0.80) | C |
| 280 | 2.72 (2.51–2.92) | CD | 0.75 (0.69–0.80) | C |
| 300 | 2.92 (2.72–3.12) | D | 0.68 (0.63–0.73) | B C |
| 320 | 2.84 (2.64–3.04) | CD | 0.72 (0.66–0.76) | C |
* Values are expressed as mean, with 95% CI in parentheses; because of the large number of pairwise comparisons, individual p values are not reported; glucose concentrations that do not share a letter had statistically different amounts of biofilm growth at an α level of 0.05.