Associations between Wearing Masks, Hand Washing, and the Risk of COVID-19 Contraction: A Case-Control Study in the Northwest of Iran

Scientists believe that the new coronavirus causing COVID-19 is airborne. It has been approved that wearing masks and hand washing prevent the spread of COVID-19. This study aimed to evaluate the association between wearing facemasks, hand washing, and COVID-19 contraction in the population of Tabriz, Iran.

In this analytical study, necessary information was collected via four online multi-optional questionnaires on sociodemographic characteristics, the COVID-19 virus, mask-wearing behaviors, and hand hygiene habits among 360 individuals (120 cases and 240 controls). Based on data normality, quantitative variables were reported as mean ± standard deviation or the median (min-max). In addition, the relationship between qualitative variables was evaluated by the Fisher’s exact test, and correlations were assessed by the Spearman's test.

Elderly individuals and their care seekers had fewer potentials for exposure to COVID-19 (p = 0.010), but healthcare workers were at a higher risk of contracting the virus than other occupations (p = 0.002). In addition, smokers were at a lower risk of the disease than other healthy people (p = 0.009). Furthermore, the incidence of COVID-19 was significantly higher among individuals not wearing facemasks than others (p = 0.007).

we concluded that wearing a facemask was more effective than hand washing and antiseptics in preventing the incidence of COVID-19 contraction; thus, people not wearing facemasks were at a higher risk of the viral infection.