Table 1.
Age differences in mean (sd) or frequency (%) for demographic and health characteristics, physical activity, sleep, and cognitive performance. METs were limited to minutes awake. MMSE reflects score using the backwards spelling of the word “world”).
| Young | Older | Difference t(110) | p | |
|---|---|---|---|---|
| N | 59 | 53 | ||
| Age | 23.05 (2.42) | 62.68 (6.08) | 46.17 | <0.001 |
| Education | 16.09 (1.65) | 15.22 (3.05) | 1.90 | 0.06 |
| N Female | 38 (64.4%) | 36 (67.9%) | 0.38 | 0.689 |
| N African American/Black | 7 (11.9%) | 14 (26.4%) | ||
| N Asian | 3 (5.1%) | 0 | ||
| N Caucasian/White | 48 (81.4%) | 39 (73.6%) | ||
| N Pacific Islander | 1 (1.7%) | 0 | ||
| MMSE | 29.58 (0.70) | 28.89 (1.03) | 4.18 | <0.001 |
| Geriatric Mood Scale | 2.04 (2.29) | 1.50 (2.25) | 1.19 | 0.237 |
| BMI | 24.91 (6.07) | 29.07 (5.85) | 3.68 | <0.001 |
| N Smoker | 4 (6.8%) | 14 (26.4%) | 2.91 | 0.004 |
| Self-report sleep apnea | 0 | 8 (15%) | 3.44 | 0.001 |
| METs | 1.87 (0.34) | 1.51 (0.32) | 5.65 | <0.001 |
| Sleep Efficiency | 0.83 (0.07) | 0.82 (0.09) | 0.47 | 0.643 |
| Total sleep time (mins) | 382.51 (59.80) | 355.83 (67.76) | 2.21 | 0.029 |
| Working Memory | 0.12 (0.45) | −0.13 (0.57) | 2.60 | 0.010 |
| Switching | 0.29 (0.60) | −0.32 (0.628) | 5.32 | <0.001 |
| Inhibition | 0.12 (0.49) | −0.12 (0.47) | 2.65 | 0.009 |
| Verbal Ability & Fluency | 0.20 (0.63) | −0.22 (0.77) | 3.13 | 0.002 |
| Memory Recall | 0.36 (0.86) | −0.40 (1.00) | 4.26 | <0.001 |
| Processing Speed | 0.50 (0.55) | −0.56 (0.74) | 8.71 | <0.001 |