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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 factorsCases (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 ± 80.8118.5 ± 70.41.00 (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 sometimes13 (54.2%)11 (45.8%)(ref)(ref)
  Usually or always68 (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 dark57 (52.8%)51 (47.2%)2.00 (1.07–3.75)1.99 (1.02–3.90)
 Bathing in the stream after dark72 (50.4%)71 (49.6%)2.59 (1.12–5.99)2.44 (1.02–5.88)
 Work after dark26 (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