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GRADE tool to evaluate the certainty of the evidence.
| Certainty assessment |
Number of patients | Effect |
Certainty | Importance | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of the studies | Study design | Risk of bias | Inconsistency | Indirectness | Imprecision | Other considerations | Relative(95 % CI) | Absolute(95 % CI) | |||
| 3 | cross-sectional | serious | Not serious | Not serious | Not serious | none | 15574 | – | 1.77 | ⨁⨁⨁◯ | Important |
