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Table 3 Univariate and multivariate analysis of risk factors for malaria

From: Risk factor assessment for clinical malaria among forest-goers in a pre-elimination setting in Phu Yen Province, Vietnam

Risk factors

Cases (n = 81)

Controls (n = 94)

cOR (95% CI)

aOR (95% CI)

Seasonal exposure

 Number of nights slept in the forest per year (mean-SD)

130.8 ± 80.8

118.5 ± 70.4

1.00 (1.00–1.01)

1.00 (0.99–1.00)

 Go to the forest during high risk months (October–November and December)

60 (45.5%)

72 (54.5%)

0.87 (0.44–1.74)

0.76 (0.36–1.60)

Sleeping habits (in hammock-bed or floor)

 Sleep without any kind of net*#

1 (50%)

1 (50%)

  

 Use treated nets*

7 (24.1%)

22 (75.9%)

0.31 (0.12–0.77)

0.31 (0.12–0.80)

 Use untreated nets*

78 (47.3%)

87 (52.7%)

2.09 (0.52–8.37)

1.89 (0.44–8.09)

 Use net (treated or untreated) for the whole night

  Never or sometimes

13 (54.2%)

11 (45.8%)

(ref)

(ref)

  Usually or always

68 (45%)

83 (55%)

0.69 (0.29–1.65)

0.62 (0.24–1.63)

Slept in a hut without walls#

15 (79%)

4 (21%)

  

Sleep in hammock with an untreated net*

33 (43.4%)

43 (56.6%)

0.82 (0.45–1.49)

0.94 (0.48–1.84)

After dark activities

 Collecting water after dark

57 (52.8%)

51 (47.2%)

2.00 (1.07–3.75)

1.99 (1.02–3.90)

 Bathing in the stream after dark

72 (50.4%)

71 (49.6%)

2.59 (1.12–5.99)

2.44 (1.02–5.88)

 Work after dark

26 (65%)

14 (35%)

2.70 (1.30–5.63)

2.93 (1.35–6.34)

  1. *Multiple response possible
  2. #OR not computed due to insufficent number of observations