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Table 7 Comparison of models describing the 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

Population

Model type

Model

Test

LRS

d.f.

p-value

AIC

Baseline

Negative binomial

1

-

-

-

-

24679.09

  

2

1 vs. 2

50.87

1

<0.0001

24630.21

  

3†

2 vs. 3

8.35

1

0.0039

24623.86

  

4

3 vs. 4

0.02

1

0.89

24625.84

 

Zero-inflated negative binomial

1I

-

-

-

-

23990.51

  

2I

1 vs. 2

26.89

1

<0.0001

23965.62

  

3I

2 vs. 3

0.41

1

0.52

23967.20

  

4I†

3 vs. 4

6.04

1

0.014

23963.17

   

2 vs. 4

6.45

2

0.049

 

1st re-infection

Negative binomial

1

-

-

-

-

14404.20

  

2

1 vs. 2

44.42

1

<0.0001

14361.78

  

3

2 vs. 3

4.06

1

0.044

14359.72

  

4†

3 vs. 4

4.50

1

0.025

14356.72

 

Zero-inflated negative binomial

1I

-

-

-

-

14043.52

  

2I†

1 vs. 2

24.52

1

<0.0001

14020.97

  

3I

2 vs. 3

0.25

1

0.62

14022.73

  

4I

3 vs. 4

0.68

1

0.41

14024.04

2nd re-infection

Negative binomial

1

-

-

-

-

11050.10

  

2

1 vs. 2

24.11

1

<0.0001

11027.99

  

3†

2 vs. 3

5.93

1

0.015

11024.06

  

4

3 vs. 4

1.72

1

0.19

11024.33

 

Zero-inflated negative binomial

1I

-

-

-

-

10715.26

  

2I†

1 vs. 2

7.24

1

0.0071

10710.02

  

3I

2 vs. 3

0.22

1

0.65

10711.81

  

4I

3 vs. 4

0.56

1

0.46

10713.26

  1. The goodness-of-fit of all NB and ZINB models fitted to the data assessed by the LRS and AIC. † denotes the best-fit of each model type in each population. Model equations are given in Table 4.