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Table 2 Quality evaluation of non-randomized controlled trials (NOS)

From: RETRACTED ARTICLE: Comparison of bone morphogenetic protein and autologous grafting in the treatment of limb long bone nonunion: a systematic review and meta-analysis

Study First item Second item Third item Fourth Item Fifth item Sixth item Seventh item Eighth item Scores
Zimmermann et al. [20] 1 1 0 1 2 1 1 1 8
Tressler et al. [21] 1 1 1 1 2 1 1 1 9
Yin et al. [22] 1 1 0 1 2 1 1 1 8
Hackl et al. [23] 1 1 0 1 2 1 1 1 8