| Mean | Standard deviation | 1 | 2 | 3 | 4 | 5 | 6 |
1. DGSD | 4.856 | 0.876 | 1 |
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2. IGSD | 4.997 | 0.924 | 0.644** | 1 |
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2. GSD | 4.926 | 0.840 | 0.930** | 0.937** | 1 |
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4. SP | 5.262 | 0.792 | 0.568** | 0.508** | 0.575** | 1 |
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5. EVP | 5.173 | 0.874 | 0.578** | 0.532** | 0.593** | 0.694** | 1 |
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6. ECP | 5.114 | 0.833 | 0.597** | 0.543** | 0.610** | 0.687** | 0.650** | 1 |