| Factor | Zinc dose | Number of studies | Heterogeneity test | Weighted mean difference | | | value | WMD | [95% CI] | value |
| Serum zinc (ug/dL) | <45 mg | | | 27.52% | | | , | <0.001 | 45–50 mg | | | 95.90% | <0.001 | | , | 0.014 | >50 mg | | | 88.90% | <0.001 | | , | <0.001 | BMI (kg/m2) | 16.5 mg | | - | - | - | | , | | ≥90 mg | | | 13.70% | | | , | | nPNA (g/kg/d) | 11 mg | | - | - | - | | , | <0.001 | 45 mg | | | 23.00% | | | , | | Dietary protein intake (g/kg/d) | 45 mg | | | 0.00% | | | , | | 50 mg | | | 0.00% | | | , | | Albumin (g/dL) | <50 mg | | | 85.60% | | | , | | ≥50 mg | | | 57.40% | | | , | | Hemoglobin (g/dL) | <45 mg | | | 71.87% | | | , | | ≥45 mg | | | 0.00% | | | , | | HDL (mg/dL) | <50 mg | | | 96.80% | <0.001 | | , | | ≥50 mg | | | 96.80% | <0.001 | | , | | LDL (mg/dL) | <50 mg | | | 79.40% | | | , | | ≥50 mg | | | 0.00% | | | , | <0.001 | TC (mg/dL) | ≤50 mg | | | 0.00% | | | , | <0.001 | >50 mg | | | 44.70% | | | , | | TG (mg/dL) | <50 mg | | | 87.00% | | | , | | ≥50 mg | | - | - | - | | , | | CRP (ng/mL) | 11 mg | | - | - | - | | , | <0.001 | 45 mg | | | 52.60% | | | , | 0.039 | MDA (nmol/mL) | <50 mg | | | 90.30% | | | , | 0.017 | ≥50 mg | | - | - | - | | , | <0.001 |
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