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Table 2 Parameter estimates, standard errors and fit statistics for snail-infested area and living snail density model

From: The effect of ecological environmental changes and mollusciciding on snail intermediate host of Schistosoma in Qianjiang city of China from 1985 to 2015

Variables

Snail-infested area (SIA)

Living snail density (LSD)

Model A

Model B

Model C

Model D

Model A

Model B

Model C

Model D

Fixed effects

 Intercept, \( \gamma_{00} \)

4.423 ± 0.405***

6.816 ± 0.693***

15.962 ± 13.016

13.428 ± 2.840***

0.288 ± 0.025***

0.647 ± 0.068***

0.913 ± 0.746

2.007 ± 0.260***

 TIME, \( \gamma_{10} \)

 

− 0.676 ± 0.100***

− 0.591 ± 0.108***

− 2.292 ± 0.424***

 

− 0.105 ± 0.013***

− 0.068 ± 0.013***

− 0.403 ± 0.050***

 MOL (0/1), \( \beta_{1} \)

  

3.811 ± 0.646***

3.142 ± 0.667***

  

0.691 ± 0.078***

0.542 ± 0.081***

 DFLP, \( \beta_{2} \)

  

− 0.027 ± 0.010**

− 0.020 ± 0.010*

  

− 0.001 ± 0.001

 

 PSCoV, \( \beta_{3} \)

  

0.016 ± 0.003***

0.014 ± 0.003***

  

0.0004 ± 0.0002

 

 MPFD * 100,\( \beta_{4} \)

  

− 0.034 ± 0.051

   

− 0.003 ± 0.003

 

 MPS, \( \beta_{5} \)

  

0.034 ± 0.013*

0.035 ± 0.013**

  

0.0003 ± 0.0007

 

 MPAR * 0.001, \( \beta_{6} \)

  

− 0.012 ± 0.005*

− 0.012 ± 0.005*

  

0.004 ± 0.001***

0.003 ± 0.001***

 AWMPFD * 100, \( \beta_{7} \)

  

− 0.080 ± 0.086

   

− 0.002 ± 0.005

 

 NDVI, \( \beta_{8} \)

  

4.882 ± 0.623***

4.863 ± 0.622***

  

0.306 ± 0.070***

0.291 ± 0.068***

 WI, \( \beta_{9} \)

  

− 0.020 ± 0.018

   

− 0.002 ± 0.002

 

 MOL × TIME, \( \beta_{10} \)

  

− 0.285 ± 0.126*

− 0.175 ± 0.133

  

− 0.113 ± 0.016***

− 0.079 ± 0.016***

 SDYR (km, \( \gamma_{01} \)

   

− 0.272 ± 0.057***

   

− 0.036 ± 0.005***

 SDYR × TIME, \( \gamma_{11} \)

   

0.037 ± 0.009***

   

0.007 ± 0.001***

Random effects

 Level 1 (residual)

  Within village, \( \sigma_{\varepsilon }^{2} \)

31.195 ± 0.910***

13.118 ± 0.420***

12.307 ± 0.396***

12.316 ± 0.395***

0.459 ± 0.013***

0.190 ± 0.006***

0.186 ± 0.006***

0.187 ± 0.006***

 Level 2

  Initial status, \( \sigma_{0}^{2} \)

67.561 ± 4.855***

198.160 ± 14.139***

178.850 ± 12.948***

170.480 ± 12.278***

0.214 ± 0.019***

1.836 ± 0.136***

1.475 ± 0.115***

1.338 ± 0.105***

  Rate of change, \( \sigma_{1}^{2} \)

 

3.616 ± 0.287***

3.561 ± 0.285***

3.393 ± 0.271***

 

0.061 ± 0.005***

0.051 ± 0.004***

0.045 ± 0.004***

  Rate of change covariance, \( \sigma_{01}^{2} \)

 

− 25.677 ± 1.955***

− 24.246 ± 1.869***

− 23.075 ± 1.774***

 

− 0.337 ± 0.025***

− 0.275 ± 0.022***

− 0.248 ± 0.020***

Fit statistics

 AIC

18723.900

17058.800

16893.800

16873.800

6455.000

4486.600

4428.600

4343.900

 BIC

18732.100

17075.100

16910.200

16890.200

6463.200

4503.000

4445.000

4360.300

  1. *P ≤ 0.05, **P ≤ 0.01, ***P ≤ 0.001