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Table 3 Validity analysis of the SAYCARE sedentary behavior questionnaire

From: Reliability and validity of a sedentary behavior questionnaire for South American pediatric population: SAYCARE study

Children (N=93)

Q1

Accelerometry data

Bland-Altman Analysis

rho

kd

Median (25th–75th percentile)

Median (25th–75th percentile)

Biasa

95%LOAb

Trendc

 Week days (min/day)

66.1 (41.0 to 96.0)

522.4 (491.7 to 547.8)

-459.5 ± 100.9

-661.4 to -257.6

- 0.57**

- 0.10

0.14

 Weekend days (min/day)

200.0 (135.0 to 285.0)

546.6 (502.4 to 598.2)

-332.6 ± 138.5

-609.6 to -55.6

0.20

0.40**

0.04

 Total days (min/day)

110.5 (74.0-154.3)

530.4 (497.2 to 560.2)

-420.2 ± 100.3

-620.9 to -219.5

-0.45**

0.07

0.03

Adolescents (N=94)

Q1

Accelerometry data

Bland-Altman Analysis

rho

kd

Median (25th–75th percentile)

Median (25th–75th percentile)

Biasa

95%LOAb

Trendc

 Week days (min/day)

102.0 (63.4 to 165.9)

570.3 (545.6 to 599.7)

-449.3 ± 87.0

-623.3 to -275.3

- 0.16

-0.26

-0.11

 Weekend days (min/day)

180.0 (96.4 to 260.0)

599.2 (568.9 to 627.6)

-399.7 ± 105.0

-609.6 to -189.7

0.66**

0.21

0.36**

 Total days (min/day)

131.1 (97.1 to 178.2)

582.2 (554.3 to 609.1)

-435.1 ± 66.3

-566.6 to -302.6

0.08

0.06

0.05

  1. Values are median (25th–75th percentile). Q1 Questionnaire first application, rho Spearman correlation coefficient
  2. Moderate (or above) values of spearman correlation (rho ≥ 0.30) and kappa agreement (k ≥ 0.40) are in bold
  3. aBias: average difference between methods (Q1 and accelerometer)
  4. bLOA: Limits of agreement calculated using Bland-Altman test
  5. cTrend, Pearson’s correlation coefficients between the absolute value of the difference versus the average of the two variables (Q1 vs accelerometer). Whether r>0 and p< 0.05, there is heteroscedasticity between the variables
  6. d weighted (quadratic) Cohen’s kappa-coefficient for quartiles comparison
  7. *p ≤.05
  8. **p ≤ .01