Comparison 7. Haemoglobin concentration.
| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 1 Haemoglobin concentration | 16 | 7791 | Mean Difference (IV, Random, 95% CI) | ‐1.32 [‐1.64, ‐0.99] |
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