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Table 3 Agreement between the five questionnaire definitions and the primary physical examination definition

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

Questionnaire definitions Global agreement Agreement among cases(1) Agreement among non-cases(2) Sn Sp
  Kappa 95% CI % % % % %
1. Primary (n = 187)(3) 0.44 0.31–0.56 72 79 66 66 79
2. Limitations in activities of daily living (n = 153)(3) 0.38 0.25–0.52 69 84 64 47 91
3. Limitations in work activities (n = 128)(3) 0.19 0.08–0.30 63 92 59 19 99
4. Limitations in household activities (n = 135)(3) 0.29 0.17–0.42 66 95 61 30 99
5. Limitations in leisure activities (n = 138)(3) 0.27 0.14–0.40 65 83 61 31 95
  1. Abbreviations: Sn = sensitivity; Sp = specificity
  2. (1) Cases based on questionnaire definition. Agreement among cases corresponds to the positive predictive value.
  3. (2) Non-cases based on questionnaire definition. Agreement among non-cases corresponds to the negative predictive value.
  4. (3) N of workers vary because of the requirements of each definition