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Prevalence of unmasked and improperly masked behavior in indoor public areas during the COVID-19 pandemic: Analysis of a stratified random sample from Louisville, Kentucky
Author(s) -
Seyed M Karimi,
Sonali Salunkhe,
Kelsey White,
Bertis B. Little,
W. Paul McKinney,
Riten Mitra,
YuTing Chen,
Emily R Adkins,
Julia A Barclay,
Emmanuel Ezekekwu,
Caleb X He,
Dylan M Hurst,
Martha M Popescu,
Devin N Swinney,
David A. Johnson,
Rebecca Hollenbach,
Sarah Moyer,
Natalie DuPré
Publication year - 2021
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0248324
Subject(s) - visitor pattern , stratified sampling , sample (material) , public health , covid-19 , pandemic , sample size determination , geography , environmental health , medicine , demography , socioeconomics , statistics , infectious disease (medical specialty) , sociology , mathematics , chemistry , nursing , disease , pathology , chromatography , computer science , programming language
Wearing a facial mask can limit COVID-19 transmission. Measurements of communities’ mask use behavior have mostly relied on self-report. This study’s objective was to devise a method to measure the prevalence of improper mask use and no mask use in indoor public areas without relying on self-report. A stratified random sample of retail trade stores (public areas) in Louisville, Kentucky, USA, was selected and targeted for observation by trained surveyors during December 14–20, 2020. The stratification allowed for investigating mask use behavior by city district, retail trade group, and public area size. The total number of visited public areas was 382 where mask use behavior of 2,080 visitors and 1,510 staff were observed. The average prevalence of mask use among observed visitors was 96%, while the average prevalence of proper use was 86%. In 48% of the public areas, at least one improperly masked visitor was observed and in 17% at least one unmasked visitor was observed. The average prevalence of proper mask use among staff was 87%, similar to the average among visitors. However, the percentage of public areas where at least one improperly masked staff was observed was 33. Significant disparities in mask use and its proper use were observed among both visitors and staff by public area size, retail trade type, and geographical area. Observing unmasked and improperly masked visitors was more common in small (less than 1500 square feet) public areas than larger ones, specifically in food and grocery stores as compared to other retail stores. Also, the majority of the observed unmasked persons were male and middle-aged.

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