Table 2 Comparison of daily log sheet and automated algorithms a in classifying estimated number of compliant days b , daily wear time, and bouts of nonwear
From: Identifying accelerometer nonwear and wear time in older adults
Daily log Sheet | 60-min | 90-min | 120-min | 150-min | 180-min | |
|---|---|---|---|---|---|---|
Wear time (min/day); Mean ± SD | 851 ± 159 | 767 ± 199 | 808 ± 192 | 827 ± 190 | 837 ± 189 | 843 ± 188 |
Absolute difference wear time (min/day); | 113 ± 152 | 85 ± 142 | 74 ± 140 | 71 ± 140 | 70 ± 140 | |
Mean ± SD | ||||||
Root-mean-square difference (min/day) | 189 | 166 | 158 | 157 | 156 | |
Compliant days; Mean ± SD | 6.7 ± 0.6 | 6.0 ± 1.4 | 6.3 ± 1.1 | 6.4 ± 1.0 | 6.4 ± 1.0 | 6.5 ± 0.9 |
Compliant days misidentified | 171 (13%) | 96 (7%) | 77 (6%) | 68 (5%) | 62 (5%) | |
as noncompliant | ||||||
Noncompliant days misidentified | 13 (20%) | 16 (25%) | 17 (27%) | 19 (30%) | 21 (33%) | |
as compliant | ||||||
Sensitivity (Compliant days correctly | 87.2% | 92.8% | 94.2% | 94.9% | 95.4% | |
identified as compliant) | ||||||
Specificity (Noncompliant days correctly | 79.4% | 74.6% | 73.0% | 69.8% | 66.7% | |
identified as noncompliant) | ||||||
Nonwear bouts/Week; Mean ± SD | 8.5 ± 1.4 | 14.3 ± 5.6 | 10.3 ± 2.7 | 8.9 ± 1.5 | 8.4 ± 1.1 | 8.2 ± 0.8 |