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Table 4 Predictive factors of recent exposure to Plasmodium falciparum and/or Plasmodium vivax in the study area between survey 1 and survey 6

From: Characterization of Plasmodium falciparum and Plasmodium vivax recent exposure in an area of significantly decreased transmission intensity in Central Vietnam

 

Exposure any species (N = 301)

Exposure P. falciparum (N = 302)

Exposure P. vivax (N = 314)

Proportion (%)

aOR

95% CI

p value

Proportion (%)

aOR

95% CI

p value

Proportion (%)

aOR

95% CI

p value

Village

0.004

 

NS

     

0.057

 Xe Xua

11.0

1.00

 

7.1

 

7.2

1.00

 

 Tak Lang

6.3

1.14

[0.2–5.9]

6.3

 

0.0

8.1E−07

 

 Tu Nak west

30.0

5.07

[1.8–14.1]

12.0

 

21.2

3.64

[1.2–11.2]

 Tu Nak east

12.0

0.96

[0.3–2.7]

17.3

 

5.3

0.87

[0.2–3.2]

Age group (years)

0.032

   

0.032

   

0.163

 6–20a

7.8

1.00

 

0.9

1.00

 

6.8

1.00

 

 0.5–5

4.2

0.25

[0.01–4.5]

0.0

2.58E−06

 

3.9

0.54

[0.1–2.3]

 21–40

16.7

6.17

[0.5–81.2]

9.7

28.38

[0.1–11,511]

6.6

1.29

[0.3–5.2]

 41–60

41.4

15.83

[1.1–231]

41.4

138.0

[0.3–59,721]

16.7

2.21

[0.5–10.1]

 61–90

46.2

12.73

[0.9–181]

46.2

174.2

[0.4–79,207]

30.8

4.51

[1.0–20.8]

Occupation

0.441

   

0.973

 

NS

  

 School

7.3

1.00

 

0.9

1.00

 

6.4

 

 Farmer

24.6

0.52

[0.04–6.7]

20.2

0.49

[0.001–198]

11.9

 

 Other

7.2

2.85

[0.2–42.1]

1.4

0.49

[0.001–362]

5.4

 

House structure

0.047

   

0.031

 

NS

  

 On ground

28.1

1.00

 

21.2

1.00

 

11.4

 

 On stilts

12.3

0.34

[0.1–1.0]

7.1

0.23

[0.1–0.9]

7.5

 

Reported bednet use

0.005

   

0.004

 

NS

  

 Always

7.8

1.00

 

3.6

1.00

 

5.1

  

 Sometimes

21.5

3.20

[1.4–7.1]

14.8

5.25

[1.7–16.4]

11.7

  

 Total number of nights spent in the field

 

1.02

[1.0–1.1]

0.173

 

1.02

[0.98–1.1]

0.268

 

1.03

[1.0–1.1]

0.095

 Working in the field during the study

 

NS

   

NS

   

0.41

[0.1–1.4]

0.158

 Number of surveys attended

 

NS

   

NS

   

1.56

[0.9–2.7]

0.111

 Proportion of bednets in the household

 

NS

   

NS

   

0.05

[0.0–1.5]

0.086

  1. Italic values indicate significant p values
  2. NS not significant in univariate analysis, therefore not included in multivariate model
  3. aThe age group of 6–20 years old was used as the reference group as it contained the largest number of individuals