Table 3.
Validity analysis of the SAYCARE sedentary behavior questionnaire
| 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 |
Values are median (25th–75th percentile). Q1 Questionnaire first application, rho Spearman correlation coefficient
Moderate (or above) values of spearman correlation (rho ≥ 0.30) and kappa agreement (k ≥ 0.40) are in bold
aBias: average difference between methods (Q1 and accelerometer)
bLOA: Limits of agreement calculated using Bland-Altman test
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
d weighted (quadratic) Cohen’s kappa-coefficient for quartiles comparison
*p ≤.05
**p ≤ .01