Table 4.
Performance of Opal versus Actigraph GT9X and Actigraph GT3X versus GT9X on sleep measures. Abbreviations: WASO = wake after sleep onset; AT = awakening time; AL = awakening length; SE = sleep efficiency.
| Opal vs. ActiGraph GT9X | ActiGraph GT3X vs. GT9X | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Metric | Mean | SD | LB | UB | MAPE | Mean | SD | LB | UB | MAPE |
| Total sleep time (min) | 7.32 | 23.64 | −39.02 | 53.66 | 5.74 | 58.51 | 43.57 | −26.89 | 143.91 | 25.32 |
| Wake after sleep (min) | 12.15 | 10.57 | −8.58 | 32.87 | 35.60 | −3.59 | 10.90 | −24.96 | 17.78 | 28.59 |
| Awakenings (#) | −5.19 | 4.27 | −13.56 | 3.18 | 34.29 | −1.34 | 4.06 | −9.30 | 6.62 | 27.64 |
| Avg. awakening (min) | 0.09 | 0.61 | −1.11 | 1.29 | 17.40 | −0.09 | 0.39 | −0.85 | 0.68 | 10.79 |
| Sleep efficiency (%) | −2.68 | 2.29 | −7.16 | 1.80 | 3.06 | 2.48 | 1.63 | −0.72 | 5.68 | 2.95 |
| Counts (#) | 2321.51 | 3976.71 | −5472.83 | 10,115.86 | 18.94 | −600.24 | 4537.03 | −9492.83 | 8292.34 | 24.56 |