TABLE 3.
Sleep duration by age and ISI.
| Personalized (P2)–Fixed (P1) | ||||
| Young (<50 years) | Old (>50 years) | ISI 1 or 2 | ISI 3 or 4 | |
| Mean | 27 | 10 | 4 | 33 |
| P-value | 0.02 | 0.45 | 0.67 | 0.02 |
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