Table 2 Quality assessment of included RCTs
Study ID | Randomization | Concealment of allocation | Double blinding | Withdraws and dropouts | Modified Jadad score | Quality assessment |
|---|---|---|---|---|---|---|
Al et al. [11] | 2 | 0 | 0 | 0 | 2 | Low |
Rozendaal et al. [16] | 2 | 0 | 0 | 0 | 2 | Low |
Spies et al. [13] | 2 | 2 | 2 | 1 | 7 | High |
Liu et al. [20] | 2 | 0 | 0 | 0 | 2 | Low |
Khanykin et al. [36] | 2 | 0 | 0 | 1 | 3 | Low |
Bhavsar et al. [21] | 2 | 0 | 0 | 0 | 2 | Low |
Engoren et al. [12] | 2 | 0 | 0 | 0 | 2 | Low |
Muellejans et al. [22] | 1 | 0 | 0 | 1 | 2 | Low |
Muellejans et al. [23] | 1 | 0 | 1 | 1 | 3 | Low |
Karabinis et al. [24] | 1 | 0 | 0 | 0 | 1 | Low |
Baillard et al. [25] | 2 | 0 | 1 | 0 | 3 | Low |
Dahaba et al. [1] | 2 | 2 | 2 | 1 | 7 | High |
Breen et al. [26] | 1 | 0 | 0 | 0 | 1 | Low |
Belhadj Amor et al. [27] | 2 | 0 | 2 | 0 | 4 | Low |
Carrer et al. [28] | 1 | 0 | 0 | 0 | 1 | Low |
Gerlach et al. [29] | 2 | 2 | 0 | 0 | 4 | High |
Guggenherger et al. [30] | 2 | 0 | 0 | 1 | 3 | Low |
Knapik et al. [31] | 1 | 0 | 0 | 0 | 1 | Low |
Maddali et al. [32] | 2 | 0 | 0 | 1 | 3 | Low |
Myles et al. [19] | 2 | 0 | 2 | 1 | 5 | High |
Winterhalter et al. [33] | 2 | 2 | 2 | 0 | 6 | High |
Bedirli et al. [34] | 2 | 0 | 0 | 0 | 2 | Low |
Chinachoti et al. [35] | 2 | 0 | 1 | 0 | 3 | Low |