Table 2.
Comparison of total sleep time (TST) from polysomnography (PSG) and actigraphy devices†
| N | PSG | Sleepwatch | Actiwatch | Actical | |
|---|---|---|---|---|---|
| TST on PSG night (min) | 30 | 462.9 ± 71.5 | 488.1 ± 63.3 | 488.1 ± 59.7 | 494.3 ± 53.8 |
| 467.0 (417.0 – 512.0) | 495.0 (447.0, 527.0) | 491.9 (453.5, 523.5) | 506.6 (455.8, 529.3) | ||
| Difference with TST from PSG (min) | 30 | −25.1 ± 41.0 | −25.1 ± 39.3 | −31.4 ± 49.5 | |
| −26.5 (−45.0, −1.0) | −17.1 (−47.5, 5.0) | −22.9 (−58.5, 0.0) | |||
| Difference with TST from Actiwatch (min) | 30 | 0.0 ± 30.2 | −6.3 ± 18.1 | ||
| −2.1 (−5.5, 4.0) | −6.1 (−15.3, 5.3) |
(Mean ± SD; Median [IQR])
†
Sleepwatch, Sleepwatch actigraph (Ambulatory Monitoring, Inc., Ardsley, NY); Actiwatch, Actiwatch actigraph (Respironics, Pittsburgh, PA); Actical, Actical actigraph (Respironics, Pittsburgh, PA)