Table 4.
Participant ratings of 2 types of biofeedback devices, an electrocardiogram (ECG) recorder, and SMS text monitoring using the System Usability Scale (SUS) [68].
| Type of equipment useda | SUS score, mean (SD; range) | Benchmark SUS scoreb, mean (SD) |
| StressEraser (n=9) | 76.60 (16.25; 47.5-92.5) | 68 (12.5) |
| Inner Balance (n=9) | 83.61 (8.94; 70.0-92.5) | 68 (12.5) |
| Actiwave ECG recorder (n=9) | 70.00 (7.80; 60.0-77.5) | 68 (12.5) |
| SMS text message survey (n=15) | 78.50 (9.05; 65.0-100.0) | 68 (12.5) |
aA total of 18 ratings of biofeedback devices were completed: 9 for StressEraser and 9 for Inner Balance; 9 ratings were completed regarding the electrocardiogram recorder; and 15 ratings were completed regarding the SMS text message report.
bBenchmark calculation of average SUS scores [83].