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Table 2 Characteristics of 20 studies reporting progression of cervical subluxations

From: Cervical spine involvement in rheumatoid arthritis over time: results from a meta-analysis

Year of publication First author (reference) Country STROBE checklist (total = 22) Sample size Female, number (percentage) Mean age, years Disease duration, years Years of follow-up
1971 Isdale [22] New Zealand 13 171 N/A N/A 12.1 6.0
1972 Smith [23] UK 13 84 64 (76%) N/A N/A 7.8
1974 Matthews [14] UK 11 54 N/A N/A N/A 5.0
1976 Shaw [25] UK 11 75 N/A N/A N/A 6.0
1981 Winfield [29] UK 14 100 56 (56%) 54.8 7.7 7.2
1981 Pellici [15] USA 14 106 88 (83%) 62.6 30.1 6.1
1982 Weissman [60] USA 16 109 90 (83%) 63.1 20.9 4.9
1983 Winfield [7] UK 17 100 57 (57%) 57.1 10.0 9.5
1987 Morizono [32] Japan 14 27 27 (100%) 56.3 22.4 5.3
1989 Rana [16] USA 15 41 N/A N/A N/A 10
1995 Oda [61] Japan 14 49 43 (88%) 53.8 10.0 7.8
1997 Paimela [62] Finland 16 67 56 (84%) 49.7 7.0 6.5
1997 Fujiwara [63] Japan 13 79 66 (84%) N/A N/A 6.4
1998 Fujiwara [8] Japan 17 173 146 (84%) 55.6 12.5 5.9
2000 Fujiwara [42] Japan 15 161 134 (83%) 59.5 16.5 10.2
2010 Ahn [55] Korea 16 137 123 (90%) 55.1 7.4 3.0
2011 Yurube [56] Japan 18 267 220 (82%) 66.9 N/A 6.0
2012 Kaito [64] Japan 18 38 33 (87%) 61.0 14.2 4.4
2013 Kaito [65] Japan 18 91 74 (81%) 60.7 14.9 3.9
2014 Yurube [66] Japan 19 228 183 (80%) 67.0 19.2 6.0
  1. N/A, not applicable; STROBE, Strengthening the Reporting of Observational Studies in Epidemiology.