Baig 2014.

Study characteristics
Patient sampling	Patients having ASA II status, age above 18 years and known cases of diabetes mellitus planned for elective surgeries requiring general anaesthesia
Patient characteristics and setting	Those who already had airway deformity due to surgical or medical problem or those undergoing rapid sequence induction were excluded Sample size: 357 145 females Mean age: 53.7 years
Index tests	MMT, combination of tests
Target condition and reference standard(s)	Difficult laryngoscopy: Cormack and Lehane
Flow and timing	Preoperatively
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?