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Table 2 Attack rate of malaria according to the number of abandoned wells within two kilometres, Naxalbari block, Darjeeling district, West Bengal, India, April 2005-March 2006a

From: A malaria outbreak in Naxalbari, Darjeeling district, West Bengal, India, 2005: weaknesses in disease control, important risk factors

Number of wells within 2 kilometres # Cases Population Attack rate per 1,000 Ratio
0 636 35,063 18 Reference
1 1,511 25,792 59 3
2 4,010 22,245 180 10
3 552 670 824 45
Overall 6,709 83,770 80 -
  1. a Chi Square for linear trend = 6769; p value = < 0.0000