Table 3

Binary logistic regression of larval mortality of Stegomyia aegypti (Linnaeus, 1762), considering the influence of concentration of Brazilian pepper, Schinus terebinthifolia Raddi, essential oil and the incubation time.

Model

Coefficient

Standard Error

Z

p

Odds Ratio and limits (95%)

Ratio

Inferior

Superior

Interaction of essential oil concentration and Incubation time

Constant

-2.889

0.334

-8.65

0.00**

Concentration

0.006

0.001

8.70

0.00**

1.01

1.00

1.01

Time

0.020

0.006

3.22

0.00**

1.02

1.01

1.03

Concentration × Time

0.000

0.000

-1.87

0.06^ns

G = 514.5; p < 0.01. df = 3; Hosmer χ² = 82.65. p < 0.01**

Essential oil concentration + incubation time

Constant

-2.392

0.193

-12.42

0.00**

Concentration

0.005

0.000

19.20

0.00**

1.00

1.00

1.01

Time

0.010

0.003

3.26

0.00**

1.01

1.00

1.02

G = 510.96. p < 0.01. df = 2; Hosmer χ² = 57.26; p < 0.01**

Essential oil concentration

Constant

-1.911

0.118

-16.20

0.00**

Concentration

0.005

0.000

19.20

0.00**

1.00

1.00

1.01

G = 500.25. p < 0.01. df = 1; Hosmer χ² = 87.03. p < 0.01**

Incubation time

Constante

-0.246

0.131

-1.88

0,06^ns

Time

0.007

0.003

2.77

0,01**

1.00

1.00

1.01

G = 7.72. p < 0.01. df = 1; Hosmer χ² = 0.004. p = 0.95^ns

Z: standard coefficient; p: significance level; **highly significant; df: degrees of freedom.

Silva et al. Parasites & Vectors 2010 3:79   doi:10.1186/1756-3305-3-79