Table 2
Risk of bias within studies
| Type of bias | Arendts et al 25 | Braes et al 18 | Cotter et al 27 | Graf et al 26 | Lee et al 28 | Meldon et al 23 | Moons et al 17 | Salvi et al 19 | Singler et al 20 | Suffoletto et al 21 | McCusker et al 22 | Low et al 24 |
| Design |
|
| NA |
|
|
|
|
|
|
|
|
|
| Setting |
|
|
|
|
|
|
|
|
|
|
|
|
| Data collection |
|
|
|
| NA |
|
|
|
|
|
|
|
| Withdrawals and dropouts |
|
|
|
|
|
|
|
|
|
|
|
|
| Statistical analysis |
|
|
|
|
|
|
|
|
|
|
|
|
| Global rating |
|
|
|
|
|
|
|
|
|
|
|
|
NA, not available;
, low risk of bias; , moderate risk of bias; , high risk of bias. Global rating: LOW=no high risk of bias, MODERATE=1 high risk of bias, HIGH=2 or more high risk of bias.
