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Table 3 Personal protection and vector control among malaria case-patients and matched controls, Naxalbari, Darjeeling, West Bengal, India, 2005

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

Characteristics

Cases (n = 534)

Controls (n = 534)

Matched odds ratio

#

%

#

%

Estimate

95% confidence interval

Sleeping outdoors every night

190

36

150

32

3.8a

2.2 - 6.5

Using coils or repellent creams daily

120

23

152

29

0.1b

0.06 - 0.3

Using bet nets every night c

98

18

133

25

0.3d

0.1 - 0.5

Underwent indoor residual spray (DDT)

213

40

220

41

0.9

0.7 - 1.2

  1. a Fraction attributable to sleeping outdoors: 26%
  2. b Fraction attributable to the failure to use repellents: 69%
  3. c No insecticide impregnation in place at the time of the outbreak
  4. d Fraction attributable to the failure to sleep under a bed net: 57%
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Malaria Journal

ISSN: 1475-2875

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