This repository contains two data sets and two R codes. - Fischer_et_al_Data_masks_group_average_time_plot.txt: contains the group average data over time of two groups wearing different face masks. The corresponding R code to create plots of the data over time is the file Fischer_et_al_Masks_plot_group_average_time.R - Fischer_et_al_Data_masks_lme_analysis.txt: contains average data for baseline (no mask) and average data of a period where a face mask was worn for each subject. Each subject was measured twice with two different mask types. The corresponding R code to analyze the data for the effect of wearing a mask on the different parameters can be done with the file Fischer_et_al_Masks_LME_analysis.R