Table 3. Raw means (±s.e.) of cognitive test scores across actigraphy intensity (peak count) tertiles. Analysis of variance and multivariate linear regression results.
| Cognitive Test |
Actigraphy intensity (peak count) tertiles |
F-valuea | Unstandardised β coefficient (95% CI)b | ||
|---|---|---|---|---|---|
| T1 | T2 | T3 | |||
| Digit span | 16.4±3.38 | 17.5±3.5 | 17.9±3.68 | 3.66* | 0.656* (0.038, 1.275) |
| Digit symbol/coding | 58.6±12.92 | 64.0±14.55 | 63.8±13.0 | 3.77* | 1.743 (−0.605, 4.091) |
| RCFTc copy | 29.7±0.5 | 29.7±0.4 | 31.4±0.3 | 5.75** | 0.574* (−0.042, 1.190) |
| RCFT 30 min delay | 16.0±0.7 | 16.3±0.7 | 19.5±0.6 | 7.78*** | 0.538 (−0.438, 1.514) |
| CVLTd learning score | 51.1±1.4 | 53.2±1.3 | 55.2±1.3 | 2.26 | 1.132 (−0.630, 2.895) |
| COWATe letter fluency | 39.6±1.3 | 40.2±1.0 | 43.5±1.4 | 2.92 | 2.037* (0.212, 3.934) |
*P<0.05.
**P<0.01.
***P<0.001.
a
F value calculated from unadjusted one-way analysis of variance.
b
Unstandardised coefficients from multivariate linear model adjusted for age, gender and years of education (95% confidence interval).
c
RCFT, Rey Complex Figure Test.
d
CVLT, California Verbal Learning Test, version 2.
e
COWAT, Controlled Oral Word Assocation Task.