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Table 1 The refined scale of the quality assessment of diagnostic accuracy studies scale (QUADAS)

From: Sirius Scheimpflug–Placido versus ultrasound pachymetry for central corneal thickness: meta-analysis

  Kara [13] 2012 Huang [9] 2013 Jorge [12] 2013 Maresca [15] 2014 Bayhan [11] 2014 Yildirim [18] 2015 Simsek [17] 2016 Pierro [16] 2016 Kumar [14] 2017 Kuddusi [19] 2017 Mustafa [20] 2018 Nesrin [21] 2018
Were selection criteria clearly described? Y Y Y Y Y Y Y Y Y Y Y Y
Is the reference standard likely to correctly classify the target condition? Y Y Y Y Y Y Y Y Y Y Y Y
Is the time period between reference standard and index test short enough to be reasonably sure that the target condition did not change between the two tests? Y Y Y Y Y Y Y Y Y Y Y Y
Did the whole sample or a random selection of the sample, receive verification using a reference standard of a diagnosis? Y Y Y Y Y Y Y Y Y Y Y Y
Did the patients receive the same reference standard regardless of the index test result? Y Y Y Y Y Y Y Y Y Y Y Y
Was the reference standard independent of the index test? Y Y Y Y Y Y Y Y Y Y Y Y
Was the execution of the index test described in sufficient detail to permit replication of the test? Y Y Y Y Y Y Y Y Y Y Y Y
Was the execution of the reference standard described in sufficient detail to permit its replication? Y Y Y Y Y Y Y Y Y Y Y Y
Were the index test results interpreted without knowledge of the results of the reference standard? Y Y Y Y Y Y Y Y Y Y Y Y
Were the reference standard results interpreted without knowledge of the results of the index test? U Y Y Y Y Y U Y U Y Y Y
  1. Y = yes, N = no, U = unclear