The sample size of 600 households per strata (1200 total) was based on calculations for diarrhea, a more common syndrome, rather than for pneumonia as information was not available on the expected incidence of pneumonia. However, assuming a 10% household nonresponse rate, and 4.8 persons per household, a sample of 600 households per stratum should yield between 39 and 156 persons with pneumonia, assuming an annual incidence of between 1.5% and 6.0%, respectively. Given a design effect of two due to the clustering of pneumonia cases by community and household, this sample would be large enough to estimate the proportion of the population seeking healthcare outside of the house for pneumonia with a precision of 10%, assuming 70% of persons with pneumonia seek care for their illness.