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Rules for classifying determinants regarding the association with SB (based on [26])
| Proportion of analyses supporting the association (%) | Summary code | Meaning of code |
|---|---|---|
| 0–33 | 0 | No evidence |
| 34–59 | ? | Inconsistent evidence |
| 60–100 | + /− | Consistent association |
When four or more studies supported an association or no association, it was coded as + +, − − or 00
