brownfat: The brown fat data set

In gamlss.data: Data for Generalised Additive Models for Location Scale and Shape

Description

Brown fat (or brown adipose tissue) is found in hibernating mammals, its function being to increase tolerance to the cold. It is also present in newborn humans. In adult humans it is more rare and is known to vary considerably with ambient temperature. RouthierLabadie2011 analysed data on 4,842 subjects over the period 2007-2008, of whom 328 (6.8%) had brown fat. Brown fat mass and other demographic and clinical variables were recorded. The purpose of the study was to investigate the factors associated with brown fat occurrence and mass in humans.

Usage

data("brownfat")

Format

A data frame with 4842 observations on the following 14 variables.

sex

1=female, 2=male

diabetes

0=no, 1=yes

age

age in years

day

day of observation (1=1 January, ..., 365=31 December)

exttemp

external temperature (degrees Centigrade)

season

Spring=1, Summer=2, Autumn=3, Winter=4

weight

weight in kg

height

height in cm

BMI

body mass index

glycemy

glycemia (mmol/L)

LBW

lean body weight

cancerstatus

0=no, 1=yes, 99=missing

brownfat

presence of brown fat (0=no, 1=yes)

bfmass

brown fat mass (g) (zero if brownfat=0)

Source

Determinants of the Presence and Volume of Brown Fat in Humans (2011), Statistical Society of Canada, https://ssc.ca/en/case-study/determinants-presence-and-volume-brown-fat-human, , Accessed 13 February 2019,

References

Routhier-Labadie, A., Ouellet, V., Bellemare, W., Richard, D., Lakhal-Chaieb, L., Turcotte, E., and Carpentier, A. C. (2011), Outdoor Temperature, Age, Sex, Body Mass Index, and Diabetic Status Determine the Prevalence, Mass, and Glucose-Uptake Activity of 18F-FDG-Detected BAT in Humans.The Journal of Clinical Endocrinology and Metabolism, Volume 96, number 1, pp 192-199.

Examples

data(brownfat)

Example output

Warning message:
In data(brownfat) : data set 'brownfat' not found

gamlss.data documentation built on Nov. 7, 2021, 9:08 a.m.