表 3. The correlation of major variables (r value).
主要变量的相关性（r值）
| Variable | AB | SN | BI | FB |
| The abbreviations are explained in the footnote to Table 2. *** P<0.001. | ||||
| AB | 1 | |||
| SN | 0.538*** | 1 | ||
| BI | 0.332*** | 0.256*** | 1 | |
| FB | 0.331*** | 0.278*** | 0.263*** | 1 |
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