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Table 2 Validity results in the total sample and subgroups based on age, gender and education

From: Older adults’ reporting of specific sedentary behaviors: validity and reliability

  Spearman’s rhoa Bland-Altman procedure
  Regression equationb: D = b0 + (b1× A) Standard deviation of the residuals D at A = 540 minutes/dayc(95% LOA)
Total sample 0.30 -512.46 + (0.80 × A) 144.02 -81.88 (-364.16; 200.41)
Age     
  65-74 years 0.35 -512.96 + (0.85 × A) 138.37 -53.96 (-325.17; 217.24)
  75+ years 0.24 -546.49 + (0.81 × A) 144.25 -109.09 (-391.82; 173.64)
Gender     
  Men 0.35 -599.96 + (0.92 × A) 138.68 -103.55 (-375.36; 168.26)
  Women 0.24 -455.09 + (0.72 × A) 145.96 -66.59 (-352.67; 219.49)
Education     
  Non-tertiary 0.25 -525.66 + (0.83 × A) 149.07 -77.46 (-369.64; 214.72)
  Tertiary 0.39 -489.48 + (0.75 × A) 134.44 -84.48 (-347.98; 179.02)
  1. D = difference between self-reported total sitting time and accelerometer-derived sedentary time; A = average of self-reported total sitting time and accelerometer-derived sedentary time; 95% LOA = 95% limits of agreement = D ± (1.96 × standard deviation of the residuals).
  2. aAll correlations were statistically significant at p < 0.001.
  3. bAll b1’s were statistically significant at p < 0.001.
  4. c540 minutes/day is the mean of the average of self-reported total sitting time and accelerometer-derived sedentary time in the total sample.