First author (publication year)	Sequence generation	Allocation concealment	Blinding	Incomplete outcome data	Selective outcome reporting	Other sources of bias
Kaplan [53]	Low risk	Unclear	High risk	Unclear	Low risk	Low risk
Hasson-Ohayon [42]	Low risk	Unclear	High risk	Unclear	Low risk	High risk
Rotondi [54]	Unclear	Unclear	High risk	Unclear	Low risk	High risk
Silverman [43]	Unclear	Unclear	High risk	Unclear	Low risk	Low risk
Boevink [44]	Low risk	Unclear	High risk	Unclear	Low risk	Low risk
Zang [46]	Low risk	Unclear	High risk	Unclear	Low risk	High risk
Zang [47]	Low risk	Unclear	High risk	Unclear	Low risk	High risk
Gawrysiak [48]	Unclear	Unclear	High risk	Unclear	Low risk	Low risk
Bjorkman [50]	Low risk	Low risk	High risk	Unclear	Low risk	High risk
Mendelson [51]	Unclear	Unclear	High risk	Unclear	Low risk	High risk
O’Mahen [55]	Low risk	Low risk	High risk	Low risk	Low risk	Low risk
Conoley [49]	Unclear	Unclear	High risk	Unclear	Low risk	High risk
Eggert [45]	Unclear	Unclear	High risk	Unclear	Low risk	High risk
Masia-Warner [52]	Unclear	Unclear	High risk	Low risk	Low risk	High risk
Interian [56]	Low risk	Unclear	High risk	Unclear	Low risk	High risk
Solomon [70]	Unclear	Unclear	High risk	Low risk	Low risk	High risk
Aberg-Wistedt [71]	Unclear	Unclear	High risk	Unclear	Low risk	High risk
Atkinson [67]	Unclear	Unclear	High risk	Unclear	Low risk	High risk
Terzian [73]	Unclear	Low risk	High risk	Unclear	Low risk	High risk
Hasson-Ohayon [68]	Unclear	Unclear	High risk	Unclear	Low risk	High risk
Rivera [77]	Unclear	Low risk	High risk	Low risk	Low risk	Low risk
Solomon [74]	Unclear	Unclear	High risk	Low risk	Low risk	High risk
Marzillier [75]	Low risk	Low risk	High risk	Unclear	Low risk	High risk
Stravynski [72]	Unclear	Unclear	High risk	Unclear	Low risk	High risk
Bøen [69]	Low risk	Low risk	High risk	Unclear	Low risk	High risk
Cole [76]	Low risk	Low risk	High risk	Low risk	Low risk	High risk
Schene [89]	Unclear	Unclear	High risk	Unclear	Low risk	High risk
Castelein [86]	Low Risk	Low risk	High risk	Unclear	Low risk	High risk
Gelkopf [87]	Low risk	Unclear	High risk	Unclear	Low risk	High risk
Ammerman [88]	Unclear	Low risk	High risk	Low risk	Low risk	High risk