Table 2.
References | Randomization | Allocation concealment | Double blinding | Handling of dropouts | Similarity of groups at baseline |
---|---|---|---|---|---|
Niki et al. [26] | ? | ? | + | + | + |
Shehata et al. [22] | + | + | − | + | + |
Zúñiga et al. [23] | + | + | + | + | + |
Wu et al. [24] | ? | ? | + | + | + |
Shaikh et al. [14] | − | − | − | + | + |
Kanai et al. [25] | ? | ? | ? | + | + |
Kanai et al. [27] | + | + | ? | + | + |
Zakrzewska et al. [15] | + | ? | + | + | + |
Kondziolka et al. [21] | + | + | + | + | + |
Fromm et al. [17] | ? | ? | + | + | ? |
Lechin et al. [20] | + | ? | + | + | + |
Lindström and Lindblom [19] | ? | ? | ? | + | − |
Vilming et al. [16] | ? | ? | ? | + | − |
Fromm et al. [18] | ? | ? | + | + | + |
Nicol [10] | + | ? | + | + | ? |
Kilian and Fromm [11] | + | ? | + | + | ? |
Rockliff and Davis [12] | + | + | + | + | ? |
Campbell et al. [13] | + | ? | + | ? | ? |
+ risk of bias item handled correctly and described, − risk of bias item not handled correctly, ? not clear