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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).