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Table 2 Spearman's rank correlation, intra-class correlation and weighted kappa coefficients for the association of area-based and self-reported household incomes

From: Agreement between aggregate and individual-level measures of income and education: a comparison across three patient groups

  Census tract Dissemination area
  rs ICC (95%CI) k (95%CI) rs ICC (95%CI) k (95%CI)
Asthma 0.28 0.25 (0.13,0.35) 0.20 (0.13,0.27) 0.35 0.29 (0.17,0.39) 0.24 (0.16,0.32)
Rheumatoid Arthritis 0.23 0.13(-0.01,0.27) 0.13(0.02,0.23) 0.29 0.15 (0.03,0.28) 0.16(0.06,0.25)
Diabetes 0.35 0.26 (0.13,0.38) 0.27 (0.17,0.37) 0.33 0.27 (0.15,0.38) 0.23 (0.13,0.33)
  1. rs = Spearman's rank correlation
  2. ICC(3,1) = Intra-class correlation coefficient (2-way mixed model, absolute agreement)
  3. k = Weighted kappa coefficient