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

BMC Public Health

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

	Spearman’s rho^a	Bland-Altman procedure
	Spearman’s rho^a	Regression equation^b: D = b₀ + (b₁× A)	Standard deviation of the residuals	D at A = 540 minutes/day^c(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)

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).
^aAll correlations were statistically significant at p < 0.001.
^bAll b₁’s were statistically significant at p < 0.001.
^c540 minutes/day is the mean of the average of self-reported total sitting time and accelerometer-derived sedentary time in the total sample.

ISSN: 1471-2458