Table 8.
Actigraphy Sleep Variables
| Dependent variables | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| TST (min) | Sleep efficiency (%) | SOL (min) | WASO (min) | Awakenings (#) | ||||||
| Covariates | Estimate (β) | P-value | Estimate (β) | P-value | Estimate (β) | P-value | Estimate (β) | P-value | Estimate (β) | P-value |
| Sleep timing | 6.289 | .041 | −0.700 | .100 | 1.436 | .118 | 1.641 | .101 | 2.157 | .001 |
| Age | 0.100 | .892 | −0.086 | .393 | 0.084 | .708 | 0.189 | .429 | 0.201 | .191 |
| Sex | 26.571 | <.001 | 1.617 | .111 | −2.596 | .237 | 9.315 | <.001 | −1.893 | .219 |
| Race | −39.000 | .004 | −3.297 | .073 | 6.800 | .087 | −12.088 | .005 | −1.353 | .626 |
| CDR | −13.833 | .152 | −6.026 | <.001 | 11.302 | <.001 | −1.378 | .660 | 6.585 | .001 |
| ApoE4 status | 10.879 | .202 | 0.771 | .513 | −0.239 | .925 | 3.935 | .157 | −1.126 | .529 |
| Aβ42/40 | 88.351 | .629 | 9.440 | .709 | −57.531 | .295 | 17.859 | .764 | −1.019 | .979 |
| AHI | −0.558 | .156 | −0.148 | .007 | 0.127 | .283 | −0.243 | .059 | 0.446 | <.001 |
| PLMI | −0.161 | .295 | −0.032 | .133 | 0.064 | .164 | 0.003 | .960 | −0.018 | .587 |
| Daytime minutes napping | −0.004 | .981 | 0.009 | .719 | −0.007 | .898 | −0.041 | .477 | −0.068 | .065 |
TST, total sleep time; SOL, sleep onset latency; WASO, wake after sleep onset; min, minutes; CDR, clinical dementia rating; ApoE4 status, apolipoprotein E ε4 positive; AHI, apnea–hypopnea index; PLMI, periodic limb movement index; Aβ, amyloid-beta.
Bold P-values are significant at <0.05.