Table 2 Mean (95% confidence interval) age and episode of care length by type of initial pertussis confirmation
Initial pertussis confirmation | Age, years | Episode of care length, days |
|---|---|---|
ICD-9 code 033.0 (whooping cough due to B. pertussis ), N = 573 | 61.30 (60.56-62.03) | 21.41 (19.13-23.70) |
ICD-9 code 033.9 (whooping cough, organism unspecified), N = 2,231 | 63.07 (62.70-63.47) | 21.35 (20.14-22.55) |
ICD-9 code 484.3 (pneumonia in whooping cough), N = 233 | 69.43 (68.01-70.86) | 21.82 (17.61-26.03) |
Lab test positive for B. pertussis , N = 2,711 | 61.74 (61.42-62.06) | 31.17 (29.93-32.42) |