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Ah... you're in for a nasty surprise. [1]

Among this cohort, the mean self-estimated handwashing rate was 73% (range, 50%-95%), compared with the covertly observed rate for this cohort of 8.6% before and 10.8% after patient contact, with an individual mean rate of 10% (range, 0-33%).

[1] https://www.mja.com.au/journal/1996/164/7/teaching-hospital-...

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I liked how in Freakonomics (I think), they interviewed someone who worked at a hospital, and would regularly and randomly take culture samples of nurses' and doctors' and administrators' hands. The results of the culture were shown on a screensaver.

This feedback and public transparency was both amusing, and enforcing of the necessary handwashing.

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