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Table 4 Risk factor analysis for malaria infections (positive slide and/or positive IFAT (1/80)): uni- and multi-variate adjusted analysis using survey logistic regression (n = 1,434)

From: Epidemiology of forest malaria in central Vietnam: a large scale cross-sectional survey

Risk factors Prevalence (%) Cases (n/N) Unadjusted Multivariate Adjusted
    OR 95%CI OR 95%CI
Total 33.3 1,434/4,306     
Sex:       
- Male 35.8 659/1841 1   1  
- Female 34.1 775/2465 0.82 [0.71; 0.96]° 0.71 [0.59; 0.86]°
Age (y):       
- 10–20 30.6 293/959 1    
- 20–30 33.5 501/1494 1.15 [0.95; 1.39]   
- 30–40 35.6 346/972 1.26 [1.03; 1.53]°   
- 40–50 36.0 194/539 1.28 [1.09; 1.56]° - -
- 50-max 29.2 100/342 0.94 [0.67; 1.32]   
Ethnic group:       
- Kinh 13.2 30/227 0.26 [0.17; 0.43]°° 0.67 [0.29; 1.52]
- Rag Lay 36.6 1355/3705 1   1  
- Others 13.1 49/374 0.26 [0.12; 0.58]° 0.38 [0.22; 0.66]°
Education:       
- No 40.6 798/1968 1   1  
- Primary 30.1 556/1849 0.63 [0.50; 0.80]°° 0.68 [0.52; 0.88]°
- Secondary + 16.4 80/489 0.29 [0.22; 0.38]°° 0.46 [0.34; 0.64]°°
Bed-net availability:       
- No net 44.6 41/92 1.83 [1.05; 3.21]°   
- Untreated nets 40.9 9/22 1.58 [0.70; 3.54] -  
- > 2pers./net 34.3 948/2761 1.19 [0.98; 1.45]   
- 1–2 pers./net 30.5 436/1431 1    
House structure:       
- Bamboo 40.5 883/2183 1   1  
- Wooden 27.6 338/1224 0.56 [0.42; 0.76]°° 0.85 [0.68; 1.08]
- Dried mud 29.7 70/236 0.62 [0.40; 0.97]° 0.62 [0.41; 0.94]°
- Bricks 21.6 143/663 0.40 [0.30; 0.56]°° 0.81 [0.62; 1.07]
Socio-economic status:       
- No radio, TV, moto 37.8 1037/2742 1   1  
- Only radio 34.6 155/448 0.87 [0.65; 1.17] 0.97 [0.74; 1.27]
- TV only 27.6 82/297 0.63 [0.38; 1.03]° 0.73 [0.48; 1.09]
- TV + radio 20.7 34/164 0.43 [0.26; 0.71]° 0.60 [0.39; 0.93]°
- Moto (+/-radio +/-TV) 19.2 126/655 0.39 [0.28; 0.55]°° 0.54 [0.37; 0.78]°
Profession:       
- Other work 14.7 65/441 1    
- Forest work 36.5 1245/3412 3.32 [1.39; 3.42]°° -  
- No (children, students, old) 27.4 124/453 2.18 [2.36; 4.68]°   
Forest work:       
- Other work 14.7 65/441 1   1  
- Occasional (+child/retired) 25.9 258/993 2.03 [1.14; 3.18]° 1.48 [1.01; 2.17]°
- Regular, no sleep 35.7 681/1906 3.22 [2.09; 4.94]°° 1.76 [1.05; 2.94]°
- Regular + sleep 48.8 327/670 5.51 [3.42; 8.90] °° 2.86 [1.62; 5.07]°
- Missing data 34.8 103/296 -    
  1. °p < 0.05
  2. °°p < 0.001
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