Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Pairwise correlations between HRV outcome variables
| Outcome variable | NREM | REM | |
|---|---|---|---|
| Ratio (log) | Wakefulness | 0.42 (0.08)a | 0.33 (0.11)a |
| NREM | 0.47 (0.09)a | ||
| LNHF | Wakefulness | 0.55 (0.08)a | 0.46 (0.11)a |
| NREM | 0.78 (0.07)a |
HRV, heart rate variability; NREM, non-rapid eye movement; REM, rapid eye movement; LNHF; natural logarithm of HF.
Correlations reported as general estimation equations estimate (standard error).
