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Table 4 Incidence rate of clinical malaria attacks and estimations from univariate analysis of remote sensing variables (nā€‰=ā€‰4 531, except other indication)

From: Environmental determinant of malaria cases among travellers

Ā 

Number of clinical malaria attacks

Number of individuals

Number of person-days under survey

Incidence rate per 1,000 person-month

RR

95% CI

p

NDVI

Ā Ā Ā Ā Ā Ā Ā 

NDVI (M0)* >0,35

Ā Ā Ā Ā Ā Ā Ā 

ā€ƒ< 66% duration of stay

70

2 391

298 185

7.14

1

Ā Ā 

ā€ƒā‰„66% duration of stay

70

2 140

274 178

7.76

1,10

0,66 - 1,83

0,724

NDVI (M-1)* >0,35

Ā Ā Ā Ā Ā Ā Ā 

ā€ƒ< 66% duration of stay

77

2 730

342 844

6.83

1

Ā Ā 

ā€ƒā‰„66% duration of stay

63

1 801

229 519

8.35

1,33

0,80 - 2,23

0,268

NDVI (M-2)* >0,35

Ā Ā Ā Ā Ā Ā Ā 

ā€ƒ< 66% duration of stay

77

2 890

365 385

6.41

1

Ā Ā 

ā€ƒā‰„66% duration of stay

63

1 641

206 978

9.26

1,60

0,97 - 2,66

0,067

  1. CIā€‰=ā€‰confidence interval; NDVIā€‰=ā€‰Normalized Difference Vegetation Index; RRā€‰=ā€‰relative risk; * : M0, M-1 & M-2 correspond to the estimates of NDVI calculated with 0, 1 and 2ā€‰months of decay between the remote sensing and the period of stay in the sites.