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Table 3 Parameter estimates for the negative binomial models explaining the abundance of selected Phlebotomine sand fly species in Trinidad de Las Minas, Capira, Panamá

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

Parameter

Species

Proportional abundance change

Estimate

S.E.

z

Pr(>|z|)

Domicile

Lutzomyia trapidoi

1 (563) ¶

6.333

0.794

7.980

<0.00001x

Lu. gomezi

1 (38) ¶

3.647

0.220

16.586

<0.00001x

Lu. panamensis

1 (7) ¶

2.010

0.212

9.467

<0.00001x

Lu. triramula

1 (5) ¶

1.646

0.328

5.015

<0.00001x

Lu. dysponeta

1 (16) ¶

2.752

0.745

3.694

0.000221x

Peridomicile

Lu. trapidoi

0.52

−0.646

0.306

−2.108

0.0350x

Lu. gomezi

0.58

−0.551

0.278

−2

0.0454x

Lu. panamensis

3.52

1.258

0.258

4.886

<0.00001x

Lu. triramula

9.54

2.255

0.412

5.468

<0.00001x

Lu. dysponeta

1.32

0.281

0.284

0.987

0.324

Fogged

Lu.trapidoi

1.05

0.0486

0.323

0.151

0.880

Lu. gomezi

0.32

−1.128

0.292

−3.864

0.000112x

Lu. panamensis

0.60

−0.515

0.271

−1.898

0.0576

Lu. triramula

0.09

−2.381

0.452

−5.271

<0.00001x

Lu. dysponeta

0.49

−0.711

0.306

−2.323

0.0201x

M-Rain

Lu.trapidoi

0.67

−0.397

0.142

−2.792

0.00524x

Lu. dysponeta

0.66

−0.414

0.132

−3.125

0.00178x

S.D.-Rain

Lu.trapidoi

0.71

−0.337

0.0624

−5.401

<0.00001x

Lu. gomezi

0.75

−0.289

0.100

−2.884

<0.00001x

Lu. panamensis

0.76

−0.278

0.0936

−2.973

<0.00001x

Lu. triramula

1.46

0.379

0.158

2.399

<0.00001x

Lu. dysponeta

1.07

0.0669

0.0602

1.111

0.266

S.D.*M-Rain

Lu.trapidoi

1.03

0.0341

0.00859

3.973

<0.00001x

Lu. dysponeta

1.01

0.0142

0.00812

1.751

0.0798

S.D.-Rain2

Lu. gomezi

1.01

0.0101

0.00386

2.630

0.00855x

Lu. panamensis

1.01

0.0140

0.00358

3.928

<0.00001x

Lu. triramula

0.99

−0.0106

0.00586

−1.807

0.0708

  1. xStatistically Significant (P < 0.05). ¶the value inside parenthesis is the estimated abundance for the reference group, i.e., Control-Domicile. * indicates a synergistic (a.k.a. interaction) effect. The overdispersion parameter estimates (± S.E.) were 0.973 ± 0.210 for Lu. trapidoi, 1.182 ± 0.234 for Lu. gomezi, 1.487 ± 0.372 for Lu. panamensis, 0.623 ± 0.141 for Lu. triramula and 1.255 ± 0.302 for Lu. dysponeta.
  2. Parameter indicates the different variables considered in the models for the selected sand fly species (see column with heading Species). Models considered the habitat (Domicile or Peridomicile), the Fogging (Fogged), and a second degree polynomial for the monthly S.D. of daily Rainfall (S.D.-Rain) for Lutzomyia gomezi, Lu. panamensis and Lu. triramula; and the interaction between S.D. and the mean (M-Rain) monthly daily rainfall for Lu. trapidoi and Lu. dysponeta.