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Table 8 Parameter estimates from the null and best-fit statistical models describing per host net egg output

From: Density-dependent effects on the weight of female Ascaris lumbricoides infections of humans and its impact on patterns of egg production

   Negative binomial count component parameters Bernoulli component parameters
Population Model ln(λ1)
(SE)
β
(SE)
c
(SE)
γ 1
(SE)
γ 2
(SE)
γ 3
(SE)
k
(SE)
δ 0
(SE)
δ 1
(SE)
δ 2
(SE)
δ 3
(SE)
Baseline 1 (null) 5.98***
(0.081)
-0.14*
(0.068)
0.79***
(0.033)
- - - 0.61
(0.020)
- - - -
  3 (best-fit) 6.18***
(0.096)
-0.29***
(0.069)
00.74***
(0.036)
0.20***
(0.026)
-0.046**
(0.015)
- 0.63
(0.021)
- - - -
  1I (null) 6.25***
(0.066)
-0.20***
(0.053)
0.70***
(0.027)
- - - 1.08
(0.034)
0.49*
(0.24)
-0.23
(0.28)
-1.02***
(0.14)
-1.78***
(0.18)
  4I (best-fit) 6.26***
(0.076)
-0.28***
(0.055)
0.70***
(0.027)
0.18***
(0.034)
-0.00062
(0.014)
-0.015*
(0.0060)
1.10
(0.034)
0.49*
(0.24)
-0.23
(0.28)
-1.01***
(0.14)
-1.78***
(0.18)
1st re-infection 1 (null) 5.08***
(0.089)
0.023
(0.078)
1.12***
(0.038)
- - - 0.82
(0.036)
- - - -
  4 (best-fit) 5.17***
(0.099)
-0.051
(0.076)
1.11***
(0.039)
0.19**
(0.063)
-0.082**
(0.031)
0.039*
(0.017)
0.86
(0.038)
- - - -
  1I (null) 5.31***
(0.081)
0.024
(0.065)
1.02***
(0.035)
- - - 1.28
(0.044)
0.91*
(0.44)
0.52
(0.40)
-2.00***
(0.33)
-2.65***
(0.37)
  2I (best-fit) 5.28***
(0.080)
-0.027
(0.065)
1.04***
(0.034)
0.18***
(0.037)
- - 1.31
(0.04)
0.91*
(0.44)
0.51
(0.40)
-2.00***
(0.33)
-2.64***
(0.37)
2nd re-infection 1 (null) 5.71***
(0.10)
-0.17
(0.10)
0.81***
(0.047)
- - - 0.71
(0.035)
- - - -
  3 (best-fit) 5.77***
(0.11)
-0.23*
(0.10)
0.82***
(0.049)
0.27***
(0.047)
-0.078*
(0.033)
- 0.74
(0.037)
- - - -
  1I (null) 5.95***
(0.087)
-0.14
(0.077)
0.71***
(0.040)
- - - 1.23
(0.05)
0.63
(0.41)
1.07**
(0.41)
-1.62***
(0.29)
-2.56***
(0.39)
  2I (best-fit) 5.92***
(0.086)
-0.19*
(0.079)
0.72***
(0.040)
0.11**
(0.042)
- - 1.24
(0.050)
0.63
(0.41)
1.07**
(0.41)
-1.63***
(0.29)
-2.56***
(0.39)
  1. Estimated parameter values from the best-fit NB and ZINB models in each population. Parameters significantly different from 0: * p-value < 0.05, ** p-value < 0.01, ***p-value < 0.001. Model equations are given in Table 4.