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 |