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Xachariah comments on Boring Advice Repository - Less Wrong Discussion
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In a study of children in schools, setting up a 'handwashing event' 4x per day cut sick days in half. Another controlled study on hand sanitizer showed a 20% decrease in sick days.
Here's a replication on sanitizer showing 20% reduction in illness rate for college students.
http://www.fda.gov/ohrms/dockets/dailys/03/Sept03/090203/75n-0183h-c000075-att-14-vol154.pdf
Here's one in Pakistan where incidence of Pneumonia and Diarrhea in children were cut in half.
http://www.ncbi.nlm.nih.gov/pubmed/16023513
Here's one in China where intensive handwashing programs for child schools cut sickness by ~40%. http://www.ncbi.nlm.nih.gov/pubmed/17556631
The short of it is 20% to 50% fewer contagious sicknesses, depending on your current habits (assuming what holds true for children or college students holds true for you).
This seems like a pretty big assumption for many adults. Children and college students are likely in much closer quarters with many other people than a lot of office workers.
(I'm a college student, though, and will try to take this advice!)