Table 2 Minimal adequate mixed-effects linear model for oesophagus ratio of Anguillicola crassus : reference group: German parasite population in the European eel

(Intercept)

3.317222

0.032135

103.229

0.0000

Japanese eel

0.354854

0.043646

8.130

0.0000

Polish parasite population

−0.152373

0.033900

−4.495

0.0000

Taiwanese parasite population

−0.030428

0.035232

−0.864

0.3886

Dpi

−0.004029

0.000415

−9.701

0.0000

Male

−0.048802

0.022015

−2.217

0.0268

Japanese eel*Dpi

0.002353

0.000802

2.933

0.0037