Table 3.
Number of participants with 1–8 days of valid actigraphy data as well as the number of days of overlap between valid actigraphy and two devices measuring environmental factors
| Maximum number of days of data | Wrist actigraphy* | Hobo (temperature, light)b | Extech (sound)† |
|---|---|---|---|
| 0 | 47 | 554 | 628 |
| 1 | 1 | 2 | 7 |
| 2 | 8 | 5 | 7 |
| 3 | 6 | 3 | 7 |
| 4 | 9 | 6 | 9 |
| 5 | 21 | 9 | 8 |
| 6 | 71 | 38 | 31 |
| 7 | 412 | 125 | 95 |
| 8 | 386 | 169 | 119 |
*Days are defined as the number of valid primary sleep periods.
†Number of periods of recording that overlap with the primary sleep period. Note only two sites (Birmingham, AL, and Chicago, IL) distributed these devices.