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Table 2 Mean (95% confidence interval) age and episode of care length by type of initial pertussis confirmation

From: The disease burden of pertussis in adults 50 years old and older in the United States: a retrospective study

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)