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Table 4 Methodological quality criteria in prospective controlled studies

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

Reference Eriksson S 1995 Turhan A 2009 Hansson J 2012
Patient selection
 Representativeness 1 1 1
 Selection of the non-exposed cohort 1 1 1
 Ascertainment of exposure 0 1 1
 Demonstration that outcome of interest was not present at start of study 1 0 1
Comparability
 Most important factor 1 1 1
 Other additional factor   0 0
Outcome
 Assessment 0 0 1
 Follow-up long enough for outcomes to occur 0 1 1
 Adequacy of follow-up 1 1 0
Aggregate score 5 6 7