Table 3.
Feasibility and vital sign measures for the AECOPDa and Stable groups.
| Measures | AECOPD group (n=35) | Stable group (n=49) | P value | ||||
| Duration worn (days; maximum, 42 days), median (IQR) | 33.0 (23.0-39.5) | 38.0 (32.0-40.0) | .11 | ||||
| Duration worn (weeks), n (%) | |||||||
|
|
>5 | 16 (45.7) | 35 (71.4) | .02 | |||
|
|
4-5 | 8 (22.9) | 4 (8.2) | .11 | |||
|
|
3-4 | 3 (8.6) | 5 (10.2) | >.99 | |||
|
|
2-3 | 2 (5.7) | 3 (6.1) | >.99 | |||
|
|
1-2 | 4 (11.4) | 1 (2.1) | .16 | |||
|
|
<1 | 2 (5.7) | 1 (2.1) | .57 | |||
| Longest number of consecutive days worn (days), median (IQR) | 17.0 (7.0-29.5) | 21.0 (10.0-38.0) | .34 | ||||
| Occasions of missing days (days), median (IQR) | 2.0 (0.25-5.75) | 3.0 (1.0-5.0) | .56 | ||||
| Flat sensor electronics module battery depletion during wear, n (%) | 0 (0%) | 3 (6%) | .26 | ||||
| Wear time (hours), median (IQR) | 12.1 (10.4-12.6) | 11.9 (10.9-13.3) | .36 | ||||
| Heart rate signal quality (%), median (IQR) | 88.5 (75.8-92.6) | 92.3 (81.0-96.4) | .04 | ||||
| Respiratory rate signal quality (%), median (IQR) | 93.4 (91.5-94.9) | 93.2 (91.8-94.6) | .61 | ||||
| Heart rate data quality (%), median (IQR) | 78.1 (55.7-88.0) | 86.0 (58.8-95.5) | .10 | ||||
| Respiratory rate data quality (%), median (IQR) | 83.7 (75.2-91.5) | 85.5 (77.2-89.9) | .97 | ||||
| Skin temperature data quality (%), median (IQR) | 95.6 (89.1-97.9) | 97.0 (92.1-98.9) | .27 | ||||
| Heart rate (beats/min), mean (SD) | 84.4 (10.3) | 84.4 (10.2) | .97 | ||||
| Respiratory rate (breaths/min), mean (SD) | 20.6 (3.5) | 20.3 (3.2) | .71 | ||||
| Skin temperature (°C), mean (SD) | 34.2 (0.81) | 34.3 (0.98) | .90 | ||||
| Stationary (hours), median (IQR) | 10.2 (9.7-11.4) | 10.2 (9.5-11.5) | .88 | ||||
| Physical activity (% of wear time), median (IQR) | 10.1 (8.6-15.0) | 13.4 (9.5-19.3) | .03 | ||||
aAECOPD: acute exacerbation of chronic obstructive pulmonary disease.