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Table 4 Results of interaction factors associated with handwashing a, b

From: Association between years with incidence of communicable diseases focused on COVID-19 and hand hygiene among adults in South Korea: a cross-sectional study

Variables Handwashing
Washing frequently Washing before eating Washing after toilet Washing after going out Washing with soap
OR 95% CI OR 95% CI OR 95% CI OR 95% CI OR 95% CI
Year
 2013 1.00     1.00     1.00     1.00     1.00    
 2015 0.82 (0.81 0.83) 0.83 (0.81 0.84) 0.76 (0.74 0.78) 0.63 (0.62 0.64) 0.81 (0.80 0.82)
 2017 0.83 (0.82 0.84) 0.81 (0.80 0.83) 0.80 (0.78 0.82) 0.67 (0.66 0.68) 0.80 (0.79 0.82)
 2019 0.89 (0.87 0.90) 0.76 (0.75 0.78) 0.79 (0.77 0.81) 0.74 (0.73 0.76) 0.80 (0.78 0.81)
 2020 2.18 (2.15 2.21) 2.34 (2.28 2.40) 2.75 (2.66 2.84) 4.95 (4.79 5.12) 2.69 (2.63 2.74)
Self-perceived health status
 Bad 1.00     1.00     1.00     1.00     1.00    
 Good 1.13 (1.12 1.13) 1.20 (1.19 1.22) 1.16 (1.15 1.17) 1.16 (1.15 1.17) 1.10 (1.09 1.11)
Year x Self-perceived health status
 2013 × Bad 1.00     1.00     1.00     1.00     1.00    
 2015 × Good 0.98 (0.97 0.99) 0.97 (0.96 0.99) 0.95 (0.93 0.97) 0.95 (0.94 0.97) 0.98 (0.97 1.00)
 2017 × Good 0.99 (0.98 1.00) 0.98 (0.96 0.99) 0.98 (0.96 1.00) 0.97 (0.95 0.98) 0.98 (0.97 0.99)
 2019 × Good 1.00 (0.99 1.01) 0.99 (0.97 1.01) 0.97 (0.95 0.99) 0.98 (0.96 1.00) 0.98 (0.97 1.00)
 2020 × Good 1.01 (1.00 1.02) 1.08 (1.06 1.10) 1.09 (1.06 1.13) 1.11 (1.08 1.15) 1.05 (1.03 1.07)
  1. a Reference group: not washing hands always/frequently, not washing hands before eating / after toilet / after outing / with soap; odds ratio (OR); 95% confidence intervals (95% CI)
  2. b Adjusted for other covariates