Table 3.
Reliability in the 24-Hour Time Framea
| Measurement Tool | Physical Activity Category | Duration, min/d, X̅ (SD) | Differenceb (95% CI) | Significance of F Testc | ICC (95% CI) | |
|---|---|---|---|---|---|---|
| Week 1 | Week 2 | |||||
| ACT | Light (min/d) | 65.5 (34.2) | 66.3 (37.9) | 0.2 (–11.4, 11.8) | .97 | .86 (.64, .94) |
| Moderate (min/d) | 10.4 (12.8) | 8.7 (8.0) | 1.7 (–2.7, 6.1) | .43 | .75d (.46, .90) | |
| Light to moderate (min/d) | 76.9 (44.0) | 75.0 (44.8) | 1.9 (–12.8, 16.6) | .79 | .84 (.61, .94) | |
| No. of steps/d | 4,570 (2,041) | 4,374 (1,684) | 196 (–404, 796) | .50 | .89 (.70, .96) | |
| SWA | Light (mink]) | 135.8 (89.8) | 148.9 (92.6) | –13.1 (–34.6, 8.4) | .22 | .93 (.82, .97) |
| Moderate (min/d) | 45.3 (39.8) | 43.8 (34.1) | 1.5 (–8.1, 11.1) | .75 | .91 (.79, .97) | |
| Light to moderate (min/d) | 181.1 (118.1) | 192.6 (116.1) | –11.6 (–39.7, 16.5) | .40 | .93 (.82, S7) | |
| No. of steps/d | 6,104 (3,506) | 6,096 (3,134) | 8 (–759, 776) | .98 | .92 (.81, .97) | |
a
Daily physical activity duration and intraclass correlation coefficient (ICC) in 21 participants with matching data from the Actigraph (ACT) and the SenseWear Armband (SWA) in the 24-hour time frame during the 2 weeks of data collection.
b
Difference between week 1 and week 2 and corresponding 95% confidence interval (CI).
c
Significance of the F test from the analysis of variance used to calculate ICCs.
d
The point estimates of the ICCs from the ACT were not contained in the 95% Cls of the ICCs from the SWA for the duration of moderate activities.