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Table 5 Effect of time elapsed between the administrations of the questionnaire and the physical examination(1) (n = 187)

From: Agreement between a self-administered questionnaire on musculoskeletal disorders of the neck-shoulder region and a physical examination

Time elapsed Global agreement Agreement among cases(2) Agreement among non-cases (3) Sn Sp
  Kappa 95% CI %(4) %(4) %(4) % %
≤ 21 days (n = 92) 0.54 0.37–0.716 77 83 71 75 80
>21 days (n = 95) 0.33 0.15–0.52 66 74 61 56 78
  1. Abbreviations: Sn = sensitivity; Sp = specificity
  2. (1) Primary definitions were used in estimating the agreement.
  3. (2) Cases based on questionnaire definition. Agreement among cases corresponds to the positive predictive value.
  4. (3) Non-cases based on questionnaire definition. Agreement among non-cases corresponds to the negative predictive value.
  5. (4) None of the comparisons reached statistical significance (χ2 test).