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Table 3 Results of exploratory factor analyses when removing items

From: A 5 item version of the Compliance Questionnaire for Rheumatology (CQR5) successfully identifies low adherence to DMARDs

Factor analysis Item removed MSA of removed item Kaiser-Meyer-Olkin Number of factors Highest eigen value Ratio of first to second eigen values Cumulative percentage of variance explained
CQR19 - - 0.79 6 4.48 2.86 61.61
CQR18 11 0.39 0.80 6 4.96 2.57 64.00
CQR17 16 0.52 0.81 5 4.92 2.55 60.87
CQR16 19 0.67 0.83 4 4.79 2.97 54.92
CQR15 12 0.69 0.83 4 4.71 3.16 56.20
CQR14 9 0.68 0.84 3 4.65 3.39 51.05
CQR13 8 0.66 0.85 3 4.60 3.37 53.69
CQR12 1 0.82 0.84 2 4.30 3.36 54.97
CQR11 4 0.86 0.84 1 4.26 - 50.36