Table 1. Correlations and differences between subjective and objective sleep parameters.
mean (standard deviation) |
Pearson’s correlation coefficient (p value) |
difference† (95% confidence interval) |
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| |||||
n | subjective (daily records) |
objective (Actiwatch®) |
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Sleep latency (min) | 42 | 15 (10.7) | 7.3 (8.5) | 0.49 (<0.001) | 7.67 (4.64-10.71) |
Sleep start (hr:min) | 42 | 23:49 (0:53) | 23:47 (0:52) | 0.99 (<0.001) | 0:02 (-0:01-0:05) |
Sleep end (hr:min) | 42 | 7:00 (0:26) | 6:58 (0:26) | 0.99 (<0.001) | 0:02 (0:01-0:03) |
Assumed sleep (min) | 42 | 424.1 (46.4) | 415.9 (45.0) | 0.97 (<0.001) | 8.19 (4.93-11.45) |
† : subjective value minus objective value