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Table 4 Cholera incidence rate and population-based rate ratios by strata of districts classified according to level of overcrowding, 1997–2001.

From: Spatial and demographic patterns of Cholera in Ashanti region - Ghana

Overcrowding index Cholera
cases
Sub
Population
Rate (per 10000) Rate ratio(95%CI)
Low     
(-4.5 < OI < -1.66) 51 1048225 0.49 Reference
Medium     
(-0.73 < OI < -0.37) 310 764556 4.05 8.33 (6.14–11.34)
High     
(-0.25 < OI < 3.20) 2870 1896170 15.14 31.11 (23.40–41.46)
  1. Chi-square for linear trend = 1757.2, P-value = 0.000001