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Table 1 Assessment quality of included studies

From: A meta-analysis and systematic review: adjuvant interferon therapy for patients with viral hepatitis-related hepatocellular carcinoma

Study Trial type Randomization allocation concealment Blinding Lost of follow up ITT Grade
Kubo S (2002) [9] RCT Adequate Unclear Adequate Yes Yes B
Shiratori Y (2003) [10] RCT Adequate Adequate Adequate Yes Yes A
Lin SM (2004) [11] RCT Unclear Unclear Unclear Yes Yes B
Piao CY (2005) [12] RCT Adequate Unclear Adequate Yes Yes B
Mazzaferro V (2006) [13] RCT Adequate Unclear Unclear Yes Yes B
Sun HC (2006) [14] RCT Adequate Adequate Adequate Yes Yes A
Lo CM (2007) [15] RCT Adequate Adequate Unclear Yes Yes B
Li M (2009) [16] RCT Adequate Unclear Unclear Yes Yes B
Li N (2010) [17] NRCT Adequate Adequate Unclear Yes Yes B
Ishikawa (2012) [18] NRCT Adequate Unclear Unclear Yes Yes B