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Table 4 Multiple linear regression analyses predicting annual indirect household costs among participants falling above and below the provincial median annual income level

From: The excess costs of childhood food allergy on Canadian families: a cross-sectional study

  Participants above the provincial median income level Participants below the provincial median income level
Cases (n = 20) Controls (n = 19) Difference 95% CI of the difference p-value Cases (n = 15) Controls (n = 16) Difference 95% CI of the difference p-value
Total annual indirect costs $11,473.86 $14,216.84 $ − 2742.98 $ − 5840.50, $354.54 0.08 $8435.37 $9720.20 $ − 1284.82 $ − 5643.47, $3073.82 0.55
 Food costs $10,706.87 $13,696.94 $ − 2990.07 $ − 6020.12, $39.97 0.06 $7880.69 $9567.01 $ − 1686.32 $ − 5888.96, $2516.33 0.42
 Healthcare consultation costs $235.13 $204.12 $31.01 $ − 164.09, $226.11 0.75 $227.42 $59.58 $167.84 $68.95, $266.73 0.002
 Research costs $364.74 $174.81 $189.94 $ − 104.39, $484.27 0.20 $217.29 $77.94 $139.34 $ − 62.63, $341.31 0.06
 Lost wages $167.12 $140.97 $26.15 $ − 337.71, $390.01 0.88 $109.97 $15.65 $94.31 $5.53, $183.09 0.04
  1. Annual household income, number of household members, and allergic comorbidities status (i.e., presence vs. absence) are included as covariates in each of the models
  2. 95% CI 95th percent confidence interval