Table 5.
Day-Level Agreement Across Methods for Classifying In-Bed Time, Out-of-Bed Time, and Sedentary Variables (Study 2; N = 5,135 days)
| Day-level variable | ||||||
|---|---|---|---|---|---|---|
|
|
||||||
| Method and statistic | Out-of-bed time (min/day) | Total sedentary time (min/day) | Percentage of wear time spent sedentary | Mean bout duration (min) | Number of sedentary breaks/ day | In-bed time (min/day) |
|
| ||||||
| Descriptive statistics | ||||||
| Diary, observed mean (SD) | 928.2 (84.1) | 591.4 (139.7) | 63.8 (14.2) | 15.2 (9.1) | 45.0 (15.9) | 511.8 (84.1) |
| CREA, observed mean (SD) | 947.8 (119.3)* | 557.8 (162.0)* | 58.8 (15.2)* | 15.3 (9.2) | 41.8 (15.4)* | 491.2 (119.1)* |
| ProcessingPAL, observed mean (SD) | 966.2 (151.1)* | 620.9 (173.9)* | 64.1 (13.9) | 15.1 (7.4) | 46.0 (16.6)* | — |
| CREA agreement with diary | ||||||
| MAE | 56.7 | 77.4 | 6.1 | 1.9 | 4.3 | 57.0 |
| CCC [95% CI] | .51 [.49, .53] | .71 [.70, .72] | .82 [.81, .83] | .9 [.90, .91] | .93 [.92, .93] | .50 [.48, .52] |
| rs | .64 | .76 | .87 | .91 | .94 | .64 |
| ProcessingPAL agreement with diary | ||||||
| MAE | 82.8 | 75.1 | 2.4 | 1.7 | 2.3 | — |
| CCC [95% CI] | .34 [.32, .36] | .65 [.63, .66] | .95 [.95, .95] | .73 [.72, .74] | .97 [.97, .98] | — |
| rs | .52 | .73 | .96 | .93 | .97 | — |
| ProcessingPAL agreement with CREA | ||||||
| MAE | 68.2 | 99.7 | 6.5 | 2.1 | 4.6 | — |
| CCC [95% CI] | .55 [.53, .57] | .62 [.60, .63] | .79 [.78, .80] | .78 [.77, .79] | .92 [.92, .92] | — |
| rs | .64 | .71 | .86 | .89 | .95 | — |
Note. Only days with ≥10 hr of wear time and participants with ≥4 days were included in the analysis. CCC = concordance correlation coefficient; CI = confidence interval; MAE = mean absolute error; rs = Spearman correlation.
*
Significantly different from diary, p < .001.