Table 2

Assessment of the quality of included studies

Item

Number of studies with criteria (%)


1. Hypothesis/aims of the study clearly stated

71 (100)

2. Main outcomes clearly described in the introduction/methods

71 (100)

3. Study design clearly described

62 (87)

4. Setting of the study clearly described

63 (88)

5. Source of the subjects clearly described

36 (51)

6. Sample size calculation stated and justified

7 (14)

7. Sample representative of the target population

10 (14)

8. Participation/response rate stated

9 (13)

9. (Retrospective studies) Study covers all the records of the specified time

31 (72)

10. (Retrospective studies) Limitations of the records described

5 (12)

11. (Prospective studies) Strategies described to improve participation/follow up

2 (7)

12. Non-participants/subjects lost to follow up described

4 (9)

13. Exposures accurately measured to minimize bias

67 (94)

14. Outcomes accurately measured to minimize bias

69 (97)

15. Results clearly described

71 (100)

16. Statistical methods sound and justified

68 (96)

17. P-values reported

42 (59)

18. Confidence intervals reported

44 (62)

19. Limitations of the study described

17 (23)

20. Main outcome measurements can be considered valid

71 (100)


Othman and Kendrick BMC Public Health 2010 10:83   doi:10.1186/1471-2458-10-83

Open Data