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Table 3 Subgroup analyses according to age

From: Socioeconomic disparity and the risk of contracting COVID-19 in South Korea: an NHIS-COVID-19 database cohort study

Variable Multivariable model P-value
OR (95% CI)
Age 20–39 (n = 45,423)
 Income level 2020 (Feb), per increase 5% (model 1) 1.00 (0.99, 1.01) 0.809
 Income level 2020 (Feb) (model 2)
  Q4 (Highest) 1  
  Q3 0.89 (0.81, 0.97) 0.001
  Q2 0.78 (0.69, 0.87) < 0.001
  Q1 (Lowest) 1.00 (0.90, 1.11) 0.995
  unknown 0.68 (0.50, 0.93) 0.016
Age 40–59 (n = 41,260)
 Income level 2020 (Feb), per increase 5% (model 1) 1.02 (1.01, 1.02) < 0.001
 Income level 2020 (Feb) (model 2)
  Q4 (Highest) 1  
  Q3 0.90 (0.80, 1.02) 0.106
  Q2 0.96 (0.84, 1.08) 0.487
  Q1 (Lowest) 1.23 (1.10, 1.37) < 0.001
  unknown 1.22 (0.87, 1.73) 0.250
Age ≥ 60 (n = 35,357)
 Income level 2020 (Feb), per increase 5% (model 1) 1.02 (1.01, 1.03) < 0.001
 Income level 2020 (Feb) (model 2)
  Q4 (Highest) 1  
  Q3 1.14 (1.01, 1.30) 0.048
  Q2 1.29 (1.12, 1.48) < 0.001
  Q1 (Lowest) 1.39 (1.24, 1.56) < 0.001
  unknown 0.95 (0.64, 1.43) 0.815
  1. OR odds ratio, CI confidence interval