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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 2.1 Serum vitamin E levels | 3 | Mean Difference (IV, Fixed, 95% CI) | Subtotals only | |
| 2.1.1 Up to 1 month | 2 | 36 | Mean Difference (IV, Fixed, 95% CI) | 13.59 [9.52, 17.66] |
| 2.1.2 Up to 3 months | 1 | 36 | Mean Difference (IV, Fixed, 95% CI) | 6.40 [‐1.45, 14.25] |
