Grade | Number of species cultured | Diversity | ||
---|---|---|---|---|
 | Average | Range | Number of Species/Number of Samples (Index) | Simpson's Diversity Index |
Ia | 1.5 | 1–6 | 27/162 (0.17) | 0.6 |
Ib | 1.7 | 1–7 | 38/181 (0.21) | 0.9 |
Iab | 2.0 | 1–7 | 18/60 (0.30) | 0.8 |
I-like | 2.3 | 1–8 | 30/36 (0.83) | 0.9 |
II | 2.7 | 1–6 | 35/46 (0.76) | 0.9 |
III | 3.6 | 2–8 | 33/22 (1.50) | 0.9 |
IV | 2.0 | 1–3 | 5/8 (0.63) | 0.8 |