Baseline characteristics of N = 310 children 1 to 23 months of age with pneumonia and N = 133 matched control children in Gaborone, Botswana, April 2012 to August 2014.

URI, upper respiratory infection; NA, not analyzed; WHO, World Health Organization aControls were matched to cases 1:1 by primary care clinic and date (≤2 weeks from the case enrollment). b5 children were enrolled as case subjects twice and one child was enrolled as a case subject on three occasions. cDefined as presence of rhinorrhea, nasal congestion, or cough. dWald χ2, P-values; generalized estimating equations were used to account for correlated data among children enrolled more than once as case subjects. eWeight-for-length <-3 standard deviation on standard WHO growth curves, mid-upper arm circumference <115mm (for children ≥6 months of age), or bilateral edema of nutritional origin. Baseline characteristics of N = 310 children 1 to 23 months of age with pneumonia and N = 133 matched control children in Gaborone, Botswana, April 2012 to August 2014.