Table 2.
Average Duration of Physical Activity Obtained With Various Measurement Tools in 2 Weeksa
| Measurement Tool | Physical Activity Category | Duration, min/d, X̅ (SD) | Differenceb (95% CI) | Significance of F Testc | ICC (95% CI) | SEM | 90% MDC | 95% MDC | |
|---|---|---|---|---|---|---|---|---|---|
| Week 1 | Week 2 | ||||||||
| ACT | Light (min/d) | 67.3 (33.0) | 65.0 (36.3) | 2.2 (–8.5, 13.0) | .67 | .86d (.66, .94) | 13.0 | 30.3 | 36.0 |
| Moderate (min/d) | 11.7 (13.0) | 9.0 (8.2) | 2.6 (–1.5, 6.8) | .20 | .75d (.43, .89) | 5.3 | 12.4 | 14.7 | |
| Light to moderate (min/d) | 78.9 (42.9) | 74.0 (43.2) | 4.9 (–8.8, 18.6) | .47 | .85d (.64, .94) | 16.9 | 39.4 | 46.8 | |
| No. of steps/d | 4,677 (2,032) | 4,414 (1,694) | 263 (–368, 894) | .39 | .85d (.63, .94) | 709 | 1,655 | 1,966 | |
| SWA | Light (min/d) | 138.9 (102.8) | 149.7 (98.7) | –10.8 (–27.9, 6.3) | .21 | .95e (.90, .98) | 22.5 | 52.6 | 62.5 |
| Moderate (min/d) | 45.3 (44.7) | 43.5 (36.6) | 1.8 (–6.7, 10.3) | .67 | .93 (.85, .97) | 10.8 | 25.1 | 29.8 | |
| Light to moderate (min/d) | 184.3 (138.8) | 193.2 (127.4) | –9.0 (–32.1, 14.2) | .43 | .95 (.89, .98) | 29.8 | 69.5 | 82.5 | |
| No. of steps/d | 6,262 (3,648) | 6,372 (3,432) | –110 (–763, 544) | .17 | .95 (.88, .98) | 937 | 2,186 | 2,596 | |
| CHAMPS questionnaire | Light (min/d) | 67.8 (37.4) | 58.5 (31.6) | 11.4 (3.0, 19.8) | .01 | .86 (.66, .94) | 12.9 | 30.1 | 35.8 |
| Moderate (min/d) | 41.1 (39.8) | 40.0 (46.1) | 0.61 (–8.6, 9.8) | .89 | .92f(.83, .96) | 12.2 | 28.4 | 33.7 | |
| Light to moderate (min/d) | 108.8 (57.6) | 98.5 (61.4) | 12.0 (0.18, 23.8) | .05 | .92 (.82, .97) | 16.8 | 39.3 | 46.7 | |
ACT=Actigraph, SWA=SenseWear Armband, CHAMPS=Community Healthy Activities Model P ogram for Seniors, Cl=confidence interval ICC= intraclass correlation coefficient, SEM=standard error of measurement, MDC=minimum detectable change.
Raw difference between week 1 and week 2.
Significance of the F test from the analysis of variance used to calculate ICCs.
The point estimates of the ICCs from the ACT were not contained in the 95% Cls of the ICCs from the SWA.
The point estimates of the ICCs from the SWA were not contained in the 95% Cls of the ICCs from the CHAMPS questionnaire.
The point estimates of the ICCs from the CHAMPS questionnaire were not contained in the 95% Cls of the ICCs from the ACT.