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Table 3 Quality index score for studies included in review

From: Cost of diabetes mellitus in Africa: a systematic review of existing literature

Question Reference index in Additional file 3
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
1. Was a clear definition of the illness given? + + + + + + + + + + x +
2. Were epidemiological sources carefully described? + n.a + n.a + x x
3. Were costs sufficiently disaggregated? + + + + + x + + + + + + +
4. Were activity data appropriately assessed? + + + +
5. Were the sources of all cost values analytically described + + + + + + + + + +
6. Were unit costs appropriately valued? + + + + + + +
7. Were the methods adopted carefully explained? + + + + + + + + + + +
8. Were costs discounted n.a n.s + n.a n.a n.a n.a n.a n.a n.a n.a n.a + n.a n.a n.a n.a n.a n.a n.a n.a n.a + n.a n.a n.a
9. Were the major assumptions tested in a sensitivity analysis? x x x x x x x x x x x x x x x x x x x x x x x
10. Was the presentation of study results consistent with the methodology of the study? + +
Total score by study
 √ Yes 5 6 8 5 4 1 5 5 5 6 6 6 7 4 6 7 6 4 6 5 6 7 6 7 8 4
 + partially 3 1 2 3 4 6 3 3 2 2 2 2 2 4 2 1 2 4 2 3 2 2 1 1 0 4
 x No 1 1 0 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 0 3 1 1 1
 n.a not applicable 1 1 0 1 1 2 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 0 1 1 1