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Kendall’s rank correlation could not be computed for fish because typical IOPs were found in three species only.
| τ | 2-sided p-value | |
|---|---|---|
| Amphibians | -0.62 | 0.085 |
| Birds | 0.263 | 0.015 |
| Fish | – | – |
| Mammals | 0.12 | 0.23 |
| Reptiles | 0.389 | 0.18 |
| All vertebrates | 0.296 | 5.36 ×10−6 |
