During the COVID-19 pandemic, self-report data on adherence to health protective behaviours tends to overestimate actual adherence, as observed behaviours were found to be lower than self-reported estimates. Additional signage was effective in improving observed adherence to these behaviours. It is important to be cautious when relying solely on self-reported data for assessing adherence rates.
During the COVID-19 pandemic, most data on adherence to health protective behaviours were collected via a self-report. We quantified the discrepancy between self-report data and discretely observed behaviour in a sample of university staff and students. We assessed the prevalence of cleaning hands, wearing a face-covering and maintaining distance from others. We also tested whether additional signage reminding people that these behaviours were mandatory improved observed adherence. Prevalence estimates based on self-report were higher than those based on observations. Signage was associated with improvements for observed behaviours (all chi(2) >= 6.0, P < 0.05). We caution that self-reported data can produce misleading adherence rates.
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