J.E. Slaven, M.E. Andrew, J.M. Violanti, C.M. Burchfiel, B.J. Vila
Biostatistics and Epidemiology
Branch, Health Effects Laboratory Division, National Institute for Occupational
Safety and Health, Centers for Disease Control and Prevention,
1095 Willowdale Rd, MS 4050, Morgantown, WV, 26501, USA.
Actigraphy is a useful tool in the measurement of sleep, with many applicable variables that indicate the quality
of a study participant’s sleep. Typical actigraphy derived variables from sleep studies include sleep efficiency, sleep latency,
total sleep time, and the number of nightly awakenings. Actigraphy can also give parameters for autocorrelation
and sinusoidal fitting that are used in circadian rhythm modeling. All of these variables are useful in inferential statistics
to determine differences between groups. However, no work has been done that examines a set of relationships among
these various sleep variables, which can possibly reduce the dimension of the set into a smaller number of interpretable latent
factors, which can aid in characterizing sleep quality. Factor analyses and structural equation modeling were used to
assess how these measured sleep variables load into different factors. Analyses showed that these variables load into 3
factors: sleep time, sleep activity and circadian rhythm.