Leishmaniasis sand fly vector density reduction is less marked in destitute housing after insecticide thermal fogging

Table 2 Parameter estimates for a negative binomial model explaining the abundance of all Phlebotomine sand fly species in Trinidad de las Minas, Capira District, Panamá

Parameter	Proportional abundance change	Estimate	S.E.	z	Pr(>\|z\|)
Control-Peridomicile-Zoophilic	1(308)^¶	5.730	0.451	12.712	<0.00001^x
Domicile	0.416	−0.878	0.268	−3.274	0.00106^x
Anthropophilic	0.783	−0.245	0.302	−0.812	0.417
Fogged	0.228	−1.477	0.282	−5.246	<0.00001^x
(S.D. Rain)²	1.008	0.00875	0.00265	3.301	0.000964^x
S.D. Rain	0.795	−0.230	0.0689	−3.338	0.000844^x
Domicile*Anthropophilic	0.784^§	0.880	0.377	2.335	0.0195^x
Fogged*Anthropophilic	0.482^§	0.993	0.391	2.540	0.0110^x

^xStatistically Significant (P < 0.05). ^¶the value inside parenthesis is the estimated abundance for the reference group, i.e., Control-Peridomicile-Zoophilic. * indicates a synergistic (a.k.a. interaction) effect. ^§To estimate the proportional abundance change of these interactions we considered the value in relation to the estimate for the main factors.
The overdispersion parameter estimate (± S.E.) was 1.217 ± 0.164. The model considered whether a house was fogged or not (Control), the habitat (Domicile or Peridomicile), whether species are known to feed on humans (Anthropophilic) or not (Zoophilic) and a second degree polynomial for the monthly S.D. of daily Rainfall.

ISSN: 1756-3305