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Table 2 Household frequency, malaria case frequency and relative risk of malaria in cluster (hotspot) area of malaria incidence, 2001–2004

From: Malaria hotspot areas in a highland Kenya site are consistent in epidemic and non-epidemic years and are associated with ecological factors

Year Number of households in cluster area (% of total households) Number of malaria cases in cluster area (% of total malaria cases) Relative risk in cluster area (Log likelihood statistic, P-value)a
2001 70 (12.4%) 56 (39.7%) 3.1 (LLR = 30.2, P < 0.001)
2002 105 (17.8%) 209 (49.3%) 2.6 (LLR = 108.1, P < 0.001)
2003 86 (14.1%) 90 (43.9%) 2.9 (LLR = 49.4, P < 0.001)
2004 54 (9.3%) 37 (29.3%) 3.0 (LLR = 19.4, P < 0.001)
  1. aRelative risk in cluster assessed by Poisson spatial scan regression (see Methods).