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Table 1 Risk of bias summary for non-randomised studies

From: The use of maoto (Ma-Huang-Tang), a traditional Japanese Kampo medicine, to alleviate flu symptoms: a systematic review and meta-analysis

Study Confounding Participant selection Classification of intervention Deviations from intended Interventions Incomplete outcome data Measurement of outcomes Selective reporting Overall
Fukutomi 2005 [18] 3 1 3 1 0 1 1 3
Taketani 2008 [22] 3 1 3 1 0 1 1 3
Tsuji 2011 [28] 3 1 1 1 0 1 1 3
Toriumi 2012 [30] 2 1 3 1 3 1 1 3
Kawamura 2007 [19] 3 1 3 1 2 1 1 3
Kawamura 2008 [21] 3 1 3 1 0 1 1 3
Kawamura 2009 [23] 3 1 3 1 0 1 1 3
Mori 2010 [24] 3 1 3 3 0 1 3 3
Nabeshima 2010 [25] 2 1 1 1 3 1 1 3
Suzuki 2011 [27] 2 1 1 1 2 1 1 2
  1. 0: No information, 1: Low, 2: Moderate, 3: Serious, 4: Critical