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. Author manuscript; available in PMC: 2014 Jun 1.
Published in final edited form as: Resuscitation. 2013 Jan 11;84(6):752–759. doi: 10.1016/j.resuscitation.2013.01.007

Table 3.

Cluster analysis of bystander CPR events, Houston, TX.

Radius # Block groups in cluster # BCPR cases expected # BCPR cases observed RR p-Value
Map A: unadjusted analysis
Primary cluster 17.2 km 360 311.5 229 0.62 <0.0001
Secondary cluster 7.7 km 112 93.8 55 0.55 0.037
Map B: adjusted analysisa
Primary cluster 4.2 km 52 37.5 13 0.34 0.027
Map C: adjusted analysisb
Primary cluster 4.1 km 52 37.4 13 0.34 0.034
Map D: adjusted analysisc
Primary cluster 4.2 km 52 36.6 13 0.34 0.046

Note: The primary cluster for each analysis is presented regardless of whether the p-value is statistically significant. Only secondary clusters with p < 0.05 are included.

a

Adjusted for age, sex, race, witnessed, public vs. private.

b

Adjusted for age, sex, race, witnessed, public vs. private, and census block percent white population.

c

Adjusted for age, sex, race, witnessed, public vs. private, and census block median household income.