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From: RETRACTED ARTICLE: Comparison of bone morphogenetic protein and autologous grafting in the treatment of limb long bone nonunion: a systematic review and meta-analysis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