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Table 1 Demographics of middle-school children with CPC*

From: Chronic productive cough in school children: prevalence and associations with asthma and environmental tobacco smoke exposure

Characteristic Children with CPC (n = 173) Children without CPC (n = 2224)
Prevalence in population 7.2% [3.3–11.1] --
Age (years): median (range) 13 (12–15) 13 (11–16)
% Female 63% [56–70] 50% [48–52]
Race (%)   
   Caucasian 29% [22–36] 31% [29–33]
   African American 27% [20–34] 20% [18–21]
   Asian 23% [17–29] 32% [30–34]
   Native American 4% [1–7] 2% [1–3]
   Other 17% [11–23] 15% [13–16]
  1. * See text for the definition of chronic productive cough (CPC). Values in brackets are 95% confidence intervals.