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Spearman correlation analysis of serum and salivary creatinine
| All patients | Stage 1 | Stage 2 | Stage 3 | Stage 4 | Stage 5 | |
|---|---|---|---|---|---|---|
| R | 0.82 | 0.16 | 0.31 | 0.38 | 0.42 | 0.55 |
| P | < 0.001 | 0.250 | 0.030 | 0.005 | 0.007 | < 0.001 |
Correlation is considered strong at (r = 1.0 to 0.5), moderate at (r = 0.3 to 0.5), weak at (r = 0.1 to 0.3), very weak or no correlation at (r < 0.1)
