mtl R Documentation

## Medial temporal lobe (MTL) and other data for 26 participants

### Description

The data are from a convenience sample of 25 women and 10 men who were middle-aged or older. The purpose of the study was to understand the relationship between sedentary behavior and thickness of the medial temporal lobe (MTL) in the brain.

### Usage

mtl


### Format

A data frame with 35 observations on the following 23 variables.

subject

ID for the individual.

sex

Gender, which takes values F (female) or M (male).

ethnic

Ethnicity, simplified to Caucasian and Other.

educ

Years of educational.

e4grp

APOE-4 status, taking a value of E4 or Non-E4.

age

Age, in years.

mmse

Score from the Mini-Mental State Examination, which is a global cognition evaluation.

ham_a

Score on the Hamilton Rating Scale for anxiety.

ham_d

Score on the Hamilton Rating Scale for depression.

dig_sym

We (the authors of this R package) are unsure as to the meaning of this variable.

delay_vp

We (the authors of this R package) are unsure as to the meaning of this variable.

bfr_selective_reminding_delayed

We (the authors of this R package) are unsure as to the meaning of this variable.

sitting

Self-reported time sitting per day, averaged to the nearest hour.

met_minwk

Metabolic equivalent units score (activity level). A score of 0 means "no activity" while 3000 is considered "high activity".

ipa_qgrp

Classification of METminwk into Low or High.

aca1

Thickness of the CA1 subregion of the MTL.

aca23dg

Thickness of the CA23DG subregion of the MTL.

ae_cort

Thickness of a subregion of the MTL.

a_fusi_cort

Thickness of the fusiform gyrus subregion of the MTL.

a_ph_cort

Thickness of the perirhinal cortex subregion of the MTL.

a_pe_cort

Thickness of the entorhinal cortex subregion of the MTL.

asubic

Thickness of the subiculum subregion of the MTL.

total

Total MTL thickness.

### Source

Siddarth P, Burggren AC, Eyre HA, Small GW, Merrill DA. 2018. Sedentary behavior associated with reduced medial temporal lobe thickness in middle-aged and older adults. PLoS ONE 13(4): e0195549. doi: 10.1371/journal.pone.0195549.

Thank you to Professor Silas Bergen of Winona State University for pointing us to this data set!

### References

A New York Times article references this study. https://www.nytimes.com/2018/04/19/opinion/standing-up-at-your-desk-could-make-you-smarter.html

### Examples


library(ggplot2)

ggplot(mtl, aes(x = ipa_qgrp, y = met_minwk)) +
geom_boxplot()