Table 1.
The percentage of coating loss between six groups using Kruskal-Wallis test.
| Group (N = 17) | Mean ± SD | Median ± IQRa | 95% CI |
χ2 statistic (df)b | P valueb | |
|---|---|---|---|---|---|---|
| Lower | Upper | |||||
| Epoxy resin pH 3.5 | 48.1 ± 23.55 | – | 36.0 | 60.2 | 75.38 (5) | <0.001 |
| Epoxy resin pH 6.75 | 31.1 ± 32.21 | 23.0 ± 62.62 | 14.6 | 47.7 | ||
| Epoxy resin (control) | 0.0 ± 0.00 | 0.0 ± 0.00 | 0.0 | 0.0 | ||
| PTFE pH 3.5 | 0.2 ± 0.50 | 0.0 ± 0.00 | −0.1 | 0.4 | ||
| PTFE pH 6.75 | 0.5 ± 1.23 | 0.0 ± 0.00 | −0.1 | 1.1 | ||
| PTFE (control) | 0.0 ± 0.00 | 0.0 ± 0.00 | 0.0 | 0.0 | ||
a
The distribution is skewed to the left.
b
Kruskal-Wallis test.