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| Grade of GIM | χ2 | P | ||||
|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | |||
| A | 20 (31.25) | 5 (7.81) | 8 (12. 5) | 31 (48.44) | 25.960 | <0.001 |
| B | 33 (51.56) | 7 (10.94) | 11 (17.19) | 13 (20.31) | ||
| C | 43 (67.19) | 3 (4.69) | 9 (14.06) | 9 (14.06) | ||
