gamlss.data (version 5.1-4)

sleep: Data on sleep

Description

Data from a study conducted on 133 patients thought to have the condition Obstructive Sleep Apnea (OSA). These patients have undergone a sleep study at a Canadian sleep clinic Ahmadi at al. (2008). While the focus on the study was the relationship between the Berlin Questionnaire for sleep apnea to polysomnographic measurements of respiratory disturbance, in particular the arousal index, we will analyse the proportion of sleep time that is REM sleep (REM). This variable is in the interval [0,1), so necessitates the use of zero-inflated models. We have removed patients with missing values, giving n=106 observations.

Usage

data("sleep")

Format

A data frame with 106 observations on the following 9 variables.

age

age in years

gender

1=female, 0=male

BMI

body mass index

necksize

neck circumference (cm)

sbp

systolic blood pressure (mmHg)

alcohol

alcohol usage (1=yes, 0=no)

caffeine

caffeine usage (1=yes, 0=no)

REM

proportion of rapid eye movement (REM) sleep time

AI

arousal index (number of arousals from sleep per hour of sleep

References

Ahmadi, N., Chung, S. A., Gibbs, A., and Shapiro, C. M. (2008), The Berlin questionnaire for sleep apnea in a sleep clinic population: relationship to polysomnographic measurement of respiratory disturbance. Sleep and Breathing, Vol. 12, pp 39-45.

Examples

# NOT RUN {
data(sleep)
# }