Table 3.
Day-Level Agreement Across Methods for Classifying In-Bed Time, Out-of-Bed Time, and Sedentary Variables (Study 1; N = 148 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)a |
|
| ||||||
| Days without nonwear (n = 38) | ||||||
| Descriptive statistics | ||||||
| Diary, observed mean (SD) | 823.6 (164.1) | 506.1 (130.6) | 61.9 (12.7) | 11.6 (6.2) | 56.2 (30.5) | 513.2 (77.0) |
| CREA, observed mean (SD) | 802.5 (176.2) | 510.1 (134.1) | 64.2 (13.2) | 11.5 (6.1) | 56.7 (30.9) | 503.2 (78.2) |
| ProcessingPAL, observed mean (SD) | 805.1 (136.1) | 499.2 (123.7) | 62.3 (12.6) | 11.4 (6.0) | 55.4 (29.4) | — |
| CREA agreement with diary | ||||||
| MAE | 33.0 | 4.0 | 2.4 | 0.1 | 0.5 | 65.1 |
| CCC [95% Cl] | .46 [.32, .58] | .45 [.33, .58] | .78 [.71, .84] | .92 [.90, .95] | .91 [.94, .88] | .69 [.77, .60] |
| rs | .91 | .99 | .88 | 1.0 | .99 | .95 |
| ProcessingPAL agreement with diary | ||||||
| MAE | 29.3 | 11.8 | 1.0 | 0.2 | 1.7 | — |
| CCC [95% Cl] | .16 [-.01, .33] | .38 [.25, .51] | .81 [.75, .86] | .92 [.89, .94] | .89 [.86, .93] | — |
| rs | .95 | .97 | .98 | 1.0 | .99 | — |
| ProcessingPAL agreement with CREA | ||||||
| MAE | 36.7 | 10.9 | 2.0 | 0.1 | 1.3 | — |
| CCC [95% Cl] | .20 [0, .49] | .37 [.10, .59] | .78 [.62, .88] | .92 [.85, .96] | .88 [.78, .93] | — |
| rs | .90 | .98 | .89 | .99 | .99 | — |
| Days with nonwear (n= 110) | ||||||
| Descriptive statistics | ||||||
| Diary, observed mean (SD) | 809.2 (134.6) | 483.3 (147.5) | 59.8 (15.6) | 12.6 (10.4) | 51.1 (24.9) | 537.4 (94.5) |
| CREA, observed mean (SD) | 867.5 (167.0)* | 569.4 (167.0)* | 65.8 (14.5)* | 13.0 (9.6) | 55.8 (25.4)* | 547.3 (143.4) |
| ProcessingPAL, observed mean (SD) | 860.5 (195.2)* | 531.9 (178.6)* | 61.9 (14.6) | 12.1 (6.3) | 54.8 (25.1) | — |
| CREA agreement with diary | ||||||
| MAE | 104.0 | 86.1 | 6.2 | 1.4 | 4.7 | 127.2 |
| CCC [95% Cl] | .16 [.10, .23] | .38 [.30, .46] | .60 [.53, .67] | .68 [.62, .74] | .72 [.66, .77] | .37 [.24, .51] |
| rs | .68 | .92 | .83 | 1.0 | .97 | .76 |
| ProcessingPAL agreement with diary | ||||||
| MAE | 101.4 | 81.2 | 3.5 | 1.1 | 3.1 | — |
| CCC [95% Cl] | .16 [.10, 0.23] | .28 [.20, .36] | .58 [.50, .66] | .61 [.53, .68] | .71 [.66, .77] | — |
| rs | .77 | .83 | .95 | 1.0 | .98 | — |
| ProcessingPAL agreement with CREA | ||||||
| MAE | 69.6 | 37.6 | 3.5 | 0.7 | 1.8 | — |
| CCC [95% Cl] | 0.15 [0.02, 0.27] | 0.29 [0.12, 0.44] | 0.64 [0.48, 0.76] | 0.64 [0.49, 0.76] | 0.88 [0.78, 0.93] | — |
| rs | .78 | .88 | .87 | .98 | .99 | — |
Note. CCC= concordance correlation coefficient; CI = confidence interval; MAE = mean absolute error; rs = Spearman correlation.
a
75 days had in-bed time; 50% were on days with nonwear time, and 50% were in children.
*
Significantly different from diary, p < .05.