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Association between number of layers and severity of niche.
| Depth/total thickness ratio | |||||
|---|---|---|---|---|---|
| <50% | >50% | Total | |||
| Number of layers | 1 | Frequency | 9 | 4 | 13 |
| % | 69.2% | 30.8% | 100.0% | ||
| 2 | Frequency | 6 | 3 | 9 | |
| % | 66.7% | 33.3% | 100.0% | ||
| Total | Frequency | 15 | 7 | 22 | |
| % | 68.2% | 31.8% | 100.0% | ||
| Exact probability | |||||
| Fisher's exact test | 0.9638 | ||||
