bmi_activity: Physical activity and body mass index

In coda.base: A Basic Set of Functions for Compositional Data Analysis

Physical activity and body mass index

Description

The 'bmi_activity' data set records the proportion of daily time spent in sleep ('sleep'), sedentary behaviour ('sedent'), light physical activity ('Lpa'), moderate physical activity ('Mpa'), and vigorous physical activity ('Vpa') for 393 children. The standardized body mass index ('zBMI') of each child is also included.

This data set was used in the example of Dumuid et al. (2019) to examine the expected differences in zBMI associated with reallocations of daily time between sleep, sedentary behaviour, and physical activity. Because the original data are confidential, 'bmi_activity' contains simulated data that mimic the main features of the original study.

Usage

bmi_activity

Format

An object of class data.frame with 393 rows and 8 columns.

References

Dumuid, D., Pedisic, Z., Stanford, T. E., Martín-Fernández, J. A., Hron, K., Maher, C., Lewis, L. K., & Olds, T. S. (2019). The Compositional Isotemporal Substitution Model: a Method for Estimating Changes in a Health Outcome for Reallocation of Time between Sleep, Sedentary Behaviour, and Physical Activity. Statistical Methods in Medical Research, 28(3), 846–857.

coda.base documentation built on March 4, 2026, 9:06 a.m.