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Table 3 Methodological quality criteria in retrospective studies

From: Meta-analysis of studies comparing conservative treatment with antibiotics and appendectomy for acute appendicitis in the adult

Reference Oliak D 2001 Tingstedt B 2002 Liu K 2007
Patient selection
 Definition adequate 1 1 1
 Representativeness 1 1 1
 Selection of controls 0 0 0
 Definition of controls 1 1 1
Comparability
 Most important factor 1 1 1
 Other additional factor 0 0 0
Exposure
 Ascertainment of exposure 1 0 0
 Same method of ascertainment for cases and controls 1 1 1
 Non-response rate 0 0 0
Aggregate score 6 5 5