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Paired comparisons and mean differences of sleep parameters recorded by Firstbeat and polysomnography.
| Parameter (minutes) | Mean differencea (SD) | SE | 95% CI | t (df=39) | P value |
| Wake | 14.03 (16.65) | 2.63 | 8.70 to 19.35 | 5.327 | <.001 |
| Light sleep | –0.80 (42.25) | 6.68 | –14.31 to 12.72 | –0.120 | .91 |
| Slow wave sleep | 4.68 (46.79) | 7.40 | –10.29 to 19.64 | 0.632 | .53 |
| REMb sleep | –17.90 (50.44) | 7.98 | –34.03 to –1.77 | –2.244 | .03 |
aMean differences calculated as Firstbeat – polysomnography.
bREM: rapid eye movement.
