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Table 3 Risk factors for the presence of Phlebotomus perniciosus in Majorca: Multivariate logistic regression model

From: Factors influencing the presence of sand flies in Majorca (Balearic Islands, Spain) with special reference to Phlebotomus pernicious, vector of Leishmania infantum

  Odds ratio (I.C. 95 %) p - Value
Altitude (m.a.s.l.)   0.019
0-50 Ref.  
51-150 8.653 (1.514 – 49.441) 0.015
>150 0.805 (0.131 – 4.964) 0.816
Settlement   
Within settlement Ref.  
Edge of/between settlement 8.080 (1.737 – 37.596) 0.008
Aspect   0.03
Other (all orientations except south-east and west facing) Ref.  
South-east-facing 34.975 (1.817 – 673.425) 0.018
West-facing 0.457 (0.116 – 1.798) 0.263
Drainage hole construction   
Plastic pipe Ref.  
Other (unlined, cement pipe) 3.451 (1.002 – 11.880) 0.050
Adjacent flora   0.001
Aleppo pine and evergreen oaks Ref.  
Garrigue shrubs 38.051 (4.900 – 295.469) 0.001
None 1.308 (0.323 – 5.307) 0.707
Sheep farm near   
No Ref.  
Yes 19.989 (3.557 – 112.322) 0.001
  1. Dependent variable presence/absence of P. perniciosus. Ref. Reference category. C. I. = Confidence interval. R2 = 0.571.