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Table 2 Modified quality index

From: Gait characteristics associated with the foot and ankle in inflammatory arthritis: a systematic review and meta-analysis

Publication Reporting External validity Internal validity bias Internal validity confounding  
1. Hypothesis clearly described? 2. Main outcomes clearly described? 3. Characteristics of the patients included clearly described? 5. Distribution of principle confounder of each group clearly described? 6. Main findings clearly described? 7. Estimates of random variability provided for the main outcomes? 10. Actual probability values reported for main outcomes? 11. Were the subjects asked to participate representative of the entire population? 12. Were the subjects who were prepared to participate representative of the entire population? 16. Was it clear if the results were based on “data dredging” 18. Were the statistical tests appropriate? 20. Were the main outcome measures valid and reliable? 21. Were all patients and controls recruited from the same population? 22. Were all patients and controls recruited over the same time period? Quality Index score total (%)
Turner [7] 1 1 1 1 1 1 0 0 0 1 1 0 0 0 8 (53)
Woodburn [8] 1 1 0 0 0 1 0 0 0 1 0 1 0 0 5 (33)
Del Din [10] 1 1 1 2 1 1 1 1 0 1 1 1 1 0 13 (87)
O’Connell [11] 1 1 0 0 1 0 0 0 0 1 0 0 0 0 4 (27)
Rome [12] 1 1 1 1 1 1 1 0 0 1 1 1 1 0 11 (73)
Woodburn [13] 1 1 1 2 1 1 1 0 0 1 1 1 0 0 11 (73)
Turner [14] 1 1 1 2 1 1 1 0 0 1 1 1 1 0 12 (80)
Turner [15] 1 1 1 2 1 1 0 0 0 1 1 1 0 0 10 (67)
Turner [16] 1 1 1 1 1 0 0 1 1 1 0 1 1 0 10 (67)
Weiss [17] 1 1 0 1 1 1 1 0 0 1 1 1 1 0 10 (67)
Khazzam [18] 1 1 0 0 1 1 1 1 0 1 1 1 1 1 11 (73)
Barn [19] 1 1 1 2 1 1 1 0 0 1 1 0 0 1 11 (73)
Woodburn [21] 1 1 1 2 1 1 1 0 0 1 1 0 0 0 10 (67)
Woodburn [34] 1 1 1 2 1 0 0 1 0 1 1 1 1 0 11 (73)
Bowen [36] 1 1 1 2 1 1 1 0 0 1 1 1 0 1 12 (80)
Dubbeldam [37] 1 1 1 1 0 1 1 0 0 1 1 1 0 0 9 (60)
Yavuz [38] 1 1 0 0 0 1 0 0 0 1 1 0 0 0 5 (33)
Rome [39] 1 1 1 1 1 1 1 0 0 1 1 0 0 0 9 (60)
Eppeland [40] 1 1 1 2 1 1 1 1 1 1 1 0 1 0 13 (87)
Schmiegel [41] 1 1 1 2 1 1 0 0 0 1 1 1 0 0 10 (67)
Schmiegel [42] 1 1 1 2 1 1 0 1 1 1 1 0 1 0 12 (80)
Laroche [43] 1 1 1 0 1 0 1 0 0 1 0 0 0 0 6 (40)
Laroche [44] 1 1 1 0 1 1 1 1 1 1 1 1 0 0 11 (73)
Semple [45] 1 1 1 0 1 1 1 1 1 1 1 1 0 0 11 (73)
Rosenbaum [46] 1 1 1 1 1 1 1 0 0 1 1 1 0 0 10 (67)
Tuna [47] 1 1 1 1 1 1 0 0 0 1 1 0 0 0 8 (53)
Otter [48] 1 0 1 1 0 1 1 0 0 1 1 0 1 0 8 (53)
Woodburn [49] 1 1 1 2 1 1 1 0 0 1 1 1 0 0 11 (73)
Siegel [50] 1 1 0 0 0 0 0 0 0 1 0 0 0 0 3 (20)
Fransen [51] 1 1 1 2 1 1 1 0 1 1 1 0 1 0 12 (80)
Isacson [52] 1 0 1 0 1 0 0 0 0 1 1 0 1 0 6 (40)
Minns [53] 0 0 1 1 1 0 0 0 0 1 0 0 0 0 4 (27)
Simkin [54] 1 1 0 0 0 0 0 0 0 1 0 0 0 0 3 (20)
Stauffer [55] 1 1 1 1 1 0 0 0 0 1 0 1 0 1 8 (53)
Mangone [56] 1 1 1 0 0 1 1 0 0 1 1 0 0 0 7 (47)
Zebouni [57] 1 1 0 0 0 0 0 0 0 1 1 0 0 0 4 (27)
  Median 10 (67)