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| Age Group (years old) | 50-60 | 61-69 | 70-87 | ||||
| N | Hours/day | N | Hours/day | N | Hours/day | P-value | |
| Mean time in hours/day | 31 | 11.0 (6.0) | 33 | 12.7 (5.1) | 29 | 10.9 (6.2) | 0.39 |
| N | #day | N | #day | N | #day | ||
| Number of days worn | 31 | 24.7 (12.3) | 33 | 24.3 (12.1) | 29 | 22.3 (11.4) | 0.72 |
