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Table 1 Methods use to assess spatial variability of legionellosis, classification criteria for high-risk census tracts, and corresponding number of census tracts, cases, and estimated population captured by each method

From: Analysis of population-level determinants of legionellosis: spatial and geovisual methods for enhancing classification of high-risk areas

Method of spatial variability “High-risk” classification # of census tracts identified as “high-risk” # of cases residing in “high-risk” census tract Estimated population within “high-risk” census tract
Unadjusted IR IR ≥ 2 per 100,000 744 1407 3,126,058
Standardized IR IR ≥ 2 per 100,000 724 1376 3,151,260
1% cluster detection Detected within a cluster 93 243 327,824
50% cluster detection Detected within a cluster 259 412 981,983
Reliable cluster detection RS ≥ 0.5 and a RR ≥ 2 136 397 507,694
  1. IR incidence rate, RS reliability score, RR relative risk