Safavi 2014.

Study characteristics
Patient sampling	Consecutive ASA I‐III adult patients
Patient characteristics and setting	"These patients were scheduled for elective surgery under general anesthesia requiring endotracheal intubation" Sample size: 476 150 females Mean age: 36.6 years
Index tests	MMT, ULBT, combination of tests
Target condition and reference standard(s)	Difficult laryngoscopy: Cormack and Lehane
Flow and timing	Not described
Comparative
Notes
Methodological quality
Item	Authors' judgement	Risk of bias	Applicability concerns
DOMAIN 1: Patient Selection
Was a consecutive or random sample of patients enrolled?
Was a case‐control design avoided?
Did the study avoid inappropriate exclusions?
DOMAIN 2: Index Test All Tests
Were the index test results interpreted without knowledge of the results of the reference standard?
If a threshold was used, was it pre‐specified?
Did the assessors of the index test have appropriate training?
Was interobserver variability reported for some or all patients?
Was interobserver agreement acceptable?
DOMAIN 3: Reference Standard
Is the reference standards likely to correctly classify the target condition?
Were the reference standard results interpreted without knowledge of the results of the index tests?
DOMAIN 4: Flow and Timing
Was there an appropriate interval between index test and reference standard?
Did all patients receive the same reference standard?
Were all patients included in the analysis?