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

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

	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

Dependent variable presence/absence of P. perniciosus. Ref. Reference category. C. I. = Confidence interval. R² = 0.571.