Table 3 Results of risk of bias assessment

Bank et al. [38]

*

*

*

*

*

5

Fair

Becerra et al. [41]

*

*

*

*

*

5

Fair

Dietz et al. [65]

*

*

*

*

*

5

Fair

Drummond et al. [63]

*

*

*

3

Low

Eberle et al. [73]

*

*

*

3

Low

Edinger et al. [55]

*

*

*

*

*

*

6

Fair

Enax-Krumova et al. [16]

*

*

*

*

4

Low

Gierthmühlen et al. [15]

*

*

*

*

*

*

6

Fair

Gossrau et al. [72]

*

*

*

*

*

*

6

Fair

Habig et al. [71]

*

*

*

*

*

5

Fair

Huge et al. [47]

*

*

*

*

*

*

6

Fair

Huge et al. [61]

*

*

*

*

*

*

6

Fair

Kemler et al. [44]

*

*

*

3

Low

Knudsen et al. [54]

*

*

*

3

Low

Kolb et al. [61]

*

*

*

*

*

5

Fair

König et al. [39]

*

*

*

*

4

Low

König et al. [40]

*

*

*

*

4

Low

Kumowski et al. [53]

*

*

*

*

*

*

6

Fair

Maier et al. [69]

*

*

*

*

*

5

Fair

Mainka et al. [49]

*

*

*

*

4

Low

Thimineur et al. [57]

*

*

*

*

4

Low

Meyer-Frießem et al. [60]

*

*

*

*

*

5

Fair

Munts et al. [70]

*

*

*

*

*

*

6

Fair

Palmer et al. [52]

*

*

*

*

*

5

Fair

Raj et al. [59]

*

*

*

3

Low

Rasmussen et al. [43]

*

*

*

*

*

5

Fair

Reimer et al. [14]

*

*

*

*

*

5

Fair

Seifert et al. [45]

*

*

*

*

4

Low

Sethna et al. [46]

*

*

*

*

*

*

6

Fair

Sieweke et al. [62]

*

*

*

*

*

5

Fair

Terkelsen et al. [18]

*

*

*

*

*

*

*

7

Good

Truffyn et al. [64]

*

*

*

*

*

5

Fair

Uçeyler et al. [66]

*

*

*

*

*

5

Fair

van Rooijen et al. [50]

*

*

*

*

*

5

Fair

van Rooijen et al. [51]

*

*

*

*

*

5

Fair

Vartiainen et al. [42]

*

*

*

*

4

Low

Vatine et al. [48]

*

*

*

*

4

Low

Weber et al. [58]

*

*

*

*

*

5

Fair

Wittayer et al. [68]

*

*

*

*

*

*

6

Fair

Wolanin et al. [56]

*

*

*

*

4

Low