Table 2.

Study quality and threats to validity

Authors	Prospective?	Blinding of Participants	Blinding of Data Collectors	Blinding of Outcome Assessors	ROC Analysis Conducted?	AUC Reported	Threats to Validity	Study Quality
Kiesel et al15	No	Unreported	Unreported	Unreported	Yes	No	Study methods, statistical methods, statistical reporting	2/7
Kiesel et al16	Yes	Unreported	Unreported	Unreported	No	No	Statistical methods	2/7
Chorba et al3	Yes	Unreported	Unreported	Unreported	No	No	Study methods, statistical methods	2/7
Peate et al28	Yes	Unreported	Unreported	Unreported	Noa	No	Limited	2/7
Butler et al2	Yes	Unreported	Unreported	Unreported	Yes	No	Statistical reporting	3/7
O’Connor et al25	Yes	Unreported	Yes	No	Yes	Yes	Limited	5/7
Shojaedin et al32	Yes	Unreported	Unreported	Unreported	Yes	No	Statistical reporting	3/7

AUC, area under the curve; ROC, receiver operator characteristic.

^aUsed other statistical methodology to determine cut score.