TableĀ 2

Levels of evidence and quality assessment ratings of health service accreditation literature

Frequency of quality assessment ratings
Study design groupsLevels of evidenceNumber of studies123
Intervention group11001
21010
3a1010
3b7232
3c3210
48332
Aetiology group10000
21001
3a0000
3b190316
3c4130
448152112
5291478
Totals122374342