From: The effect of macronutrient and micronutrient supplements on COVID-19: an umbrella review
Reference | Phase 2 | Phase 3 | |||
---|---|---|---|---|---|
1. Study eligibility criteria | 2. Identification and selection of studies | 3. Data collection and study appraisal | 4. Synthesis and findings | Risk of bias in the review | |
[13] | ✓ | ✓ | ✓ | ✓ | ✓ |
[14] | ✓ | ✓ | ✓ | ✓ | ✓ |
[15] |  ×  | ✓ | ✓ | ✓ |  ×  |
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[21] | ✓ |  ×  | ✓ |  ×  | ✓ |
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[23] | ✓ | ✓ | ✓ | ✓ | ✓ |
[24] | ✓ | ✓ | ✓ | ✓ |  ×  |
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[27] | ✓ |  ×  | ✓ | ✓ | ✓ |
[28] |  ×  | ✓ | ✓ | ✓ | ✓ |
[29] | ✓ | ✓ | ✓ | ✓ | ✓ |
[30] | ✓ | ✓ | ✓ | ✓ | ✓ |
[31] | ✓ | ✓ | ✓ | ✓ | ✓ |
[32] | ✓ | ✓ | ✓ | ✓ |  ×  |
[33] | ✓ |  ×  | ✓ | ✓ | ✓ |
[34] | ✓ | ✓ | ✓ | ✓ | ✓ |
[35] | ✓ | ✓ | ✓ | ✓ | ✓ |
[36] | ✓ | ✓ | ✓ | ✓ | ✓ |
[37] | ✓ | ✓ | ✓ |  ×  | ✓ |
[38] |  ×  | ✓ | ✓ | ✓ | ✓ |
[39] | ✓ | ✓ | ✓ | ✓ | ✓ |