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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

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

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