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. Author manuscript; available in PMC: 2017 Dec 1.
Published in final edited form as: SSM Popul Health. 2016 Dec;2:587–594. doi: 10.1016/j.ssmph.2016.08.005

Table 1.

Number of unique zip codes and census tracts for eligible and enrolled children, by case status and serotype of disease.

Enrolled cases Eligible controls Enrolled controls
Total N 661 12,050 2774
Unique zip codes 557 1209 577
Unique Census Tracts 632 4835 2126