| Factor | Intervention time | Number of studies | Heterogeneity test | Weighted mean difference | | | value | WMD | [95% CI] | value |
| Serum zinc (ug/dL) | <50 days | | | 85.90% | <0.001 | | , | | 50–60 days | | | 0.00% | | | , | <0.001 | >60 days | | | 12.90% | | | , | <0.001 | BMI (kg/m2) | 60 days | | | 13.70% | | | , | 0.838 | 90 days | | - | - | - | | , | | nPNA (g/kg/d) | <50 days | | | 0.00% | | | , | | ≥50 days | | | 31.10% | | | , | | Dietary protein intake (g/kg/d) | <50 days | | | 0.00% | | | , | | ≥50 days | | | 0.00% | | | , | <0.001 | Albumin (g/dL) | <60 days | | | 45.60% | | | , | | ≥60 days | | | 47.40% | | | , 1 | | Hemoglobin (g/dL) | <60 days | | | 0.00% | | | , | | ≥60 days | | | 72.90% | | | , | | HDL (mg/dL) | <60 days | | | 96.80% | <0.001 | | , | | ≥60 days | | | 90.10% | | | , | | LDL (mg/dL) | <60 days | | | 49.00% | | | , | <0.001 | ≥60 days | | | 95.90% | <0.001 | | , | | TC (mg/dL) | <60 days | | | 33.20% | | | , | | ≥60 days | | | 91.00% | <0.001 | | , | | TG (mg/dL) | <60 days | | - | - | - | | , | | ≥60 days | | | 8.60% | | | , | | CRP (ng/mL) | <60 days | | | 14.60% | | | , | | ≥60 days | | - | - | - | | , | <0.001 | MDA (nmol/mL) | <60 days | | - | - | - | | , | <0.001 | ≥60 days | | | 0.00% | | | , | <0.001 | SOD (U/g Hb) | <60 days | | - | - | - | | , | <0.001 | ≥60 days | | - | - | - | | , | |
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