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Table 2 Agreement, underestimation, overestimation, and kappa statistics of self-perceptions of weight compared to body fat as measured by bioelectric impedance (BIA) across residential settings at baseline

From: A secondary analysis examining the concordance of self-perception of weight and actual measurement of body fat percentage: The CRONICAS Cohort Study

  Total Lima Urban Puno Rural Puno Tumbes
n = 3181 n = 1034 n = 555 n = 565 n = 1027
Agreement 43.20% 46.30% 37.30% 37.20% 46.50%
Underestimation 49.90% 43.70% 56.80% 55.80% 49.30%
Overestimation 6.90% 10.00% 6.00% 7.10% 4.30%
Kappa (95% CI) 0.16 (0.14–0.19) 0.18 (0.14–0.22) 0.10 (0.05–0.16) 0.08 (0.02–0.13) 0.19 (0.15–0.23)
Weighted agreement 78.70% 80.50% 76.50% 75.80% 79.70%
Weighted kappa (95% CI) 0.31 (0.29–0.33) 0.30 (0.27–0.34) 0.27 (0.23–0.31) 0.20 (0.15–0.25) 0.31 (0.27–0.34)
  1. Note: Confidence intervals for kappa coefficients were estimated using a bootstrap methodology of 1000 replications