Table 2.
Results from Linear Regression Models of Total Sleep Time and Ambulatory BP
| Variable | 24-Hour | Daytime | Nighttime | Sleep-Wake Ratio | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SBP | DBP | SBP | DBP | SBP | DBP | SBP | DBP | |||||||||
| β | p | β | p | β | p | β | p | β | p | β | p | β | p | β | p | |
| Total Sleep Time | -.17 | .01 | -.17 | .01 | -.11 | .10 | -.11 | .09 | -.21 | .002 | -.13 | .05 | -.16 | .02 | -.04 | .54 |
| Race X Total Sleep Time | .97 | .05 | .82 | .10 | .87 | .09 | .69 | .18 | 1.06 | .04 | .88 | .08 | .42 | .41 | .38 | .47 |
| Total Sleep Time: Blacks | -.02 | .80 | -.04 | .60 | .03 | .73 | -.01 | .94 | -.01 | .95 | -.06 | .51 | .01 | .99 | -.01 | .99 |
| Total Sleep Time: Whites | -.34 | .001 | -.32 | .02 | -.27 | .005 | -.24 | .02 | -.36 | .001 | -.25 | .02 | -.20 | .05 | -.06 | .55 |
Covariates for full sample analyses include age, sex, race, and BMI; covariates for race-stratified analyses include age, sex, and BMI. Standardized beta coefficients signify the standard deviation (SD) change in BP as a result of a 1 SD increase in total sleep time (1 SD = .79 hours or 47.4 minutes).