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Table 2 Risk of bias assessment for included randomized controlled clinical trials

From: The effect of grape products containing polyphenols on oxidative stress: a systematic review and meta-analysis of randomized clinical trials

Study Random sequence generatin (Selection bias) Allocation concealment (Selection bias) Blinding of participants and personnel (Performance bias) Blinding of outcome assessment (Detection bias) Incomplete outcome data (Attrition bias) Selective reporting (Reporting bias) Overall quality
Lu et al. [32] Unclear Unclear Low Unclear Unclear Low Fair
Kanellos et al. [43] Low Low Low Low Unclear Low Good
Saldanha et al. [36] Low Low Low Low Low Low Good
Taghizadeh et al. [42] Low Low Low Unclear Low Low Good
Torres et al. [118] Unclear Unclear Unclear Unclear low Low Fair
Macedo et al. [45] Unclear Unclear Low Unclear Unclear Low Fair
Zunino et al. [38] Unclear Unclear Low Unclear Low Low Good
Evans et al. Low Unclear Low Unclear Low Low Good
Amoutzopoulos et al. Unclear Unclear Unclear Unclear Low Low Fair
Noguer et al. [117] Unclear Unclear Unclear Unclear Unclear Low Weak
Pourghassem et al. [44] Unclear Unclear Unclear Unclear Low Low Fair
Mellen et al. [119] Unclear Unclear Low Unclear Low Low Good
Estruch et al .[115] Low Unclear Unclear Unclear Low Low Good
Lafay et al. [116] Unclear Unclear Low Unclear Unclear Low Good
Hollis et al. [37] Unclear Unclear Unclear Unclear Low Low Fair
Rankin et al. [39] Unclear Unclear Unclear Unclear Low Low Fair
Avellone et al. [114] Unclear Unclear Unclear Unclear Unclear Low Weak