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Table 3 Child level variables and diagnosis code used

From: Which ICD-9-CM codes should be used for bronchiolitis research?

  Age ≤ 24 months Age ≤ 12 months
IRR 95% lb 95% ub IRR 95% lb 95% ub
Narrow diagnosis 1 1
 Asthma and bronchospasm codes
  Age (months) 0.99 0.99 1.00 0.99 0.98 1.00
  Age ≤ 6 months 1.04 1.00 1.08 1.01 0.96 1.07
  Antipyretic prescribed 7.36 7.02 7.73 7.16 6.79 7.55
  Male gender 0.97 0.95 1.00 0.98 0.95 1.01
  Bronchiolitis season 1.08 1.05 1.11 1.09 1.05 1.12
Component categories Age ≤ 24 months Age ≤ 12 months
OR 95% lb 95% ub OR 95% lb 95% ub
Bronchiolitis codes 1 1
 Bronchitis codes
  Age (months) 1.07 1.06 1.07 1.07 1.07 1.09
  Age ≤ 6 months 0.87 0.80 0.95 0.88 0.88 0.99
  Antipyretic prescribed 0.75 0.68 0.83 0.74 0.74 0.82
  Male gender 0.94 0.89 1.00 0.94 0.94 1.01
  Bronchiolitis season 0.62 0.58 0.65 0.63 0.63 0.67
 Asthma codes
  Age (months) 1.07 1.06 1.08 1.09 1.09 1.09
  Age ≤ 6 months 0.80 0.73 0.88 0.88 0.88 0.88
  Antipyretic prescribed 0.02 0.02 0.02 0.02 0.02 0.02
  Male gender 1.09 1.02 1.15 1.08 1.08 1.08
  Bronchiolitis season 0.56 0.53 0.60 0.56 0.56 0.56
 Bronchospasm codes
  Age (months) 1.05 1.03 1.07 1.02 1.02 1.02
  Age ≤ 6 months 0.93 0.75 1.15 0.87 0.87 0.87
  Antipyretic prescribed 0.03 0.03 0.04 0.03 0.03 0.03
  Male gender 1.03 0.89 1.18 1.03 1.03 1.03
  Bronchiolitis season 0.69 0.60 0.79 0.67 0.67 0.67
  1. Top panel: Hierarchical Poisson regression for narrow (referent) versus asthma and bronchospasm codes (i.e. broad diagnosis codes excluding narrow diagnosis codes) Bottom panels: Hierarchical multinomial logistic regression for each component of theses (bronchiolitis codes referent). IRR; incident rate ratio, OR; odds ratio, lb.; 95% confidence interval lower bound, 95% ub; 95% confidence interval upper bound