Table 4 Multivariate analysis on HEV infection in the global, black Iberian pig, and wild boar populations

Global swine population

 Giardia duodenalis

Negative

0.224

0.06‒0.754

0.016

 Cryptosporidium spp.

Negative

1.062

0.334‒3.377

0.918

 Blastocystis sp.

Negative

0.298

0.133‒0.665

0.003

 Neobalantidium spp.

Negative

1.474

0.703‒3.089

0.304

 Strongyloides spp.

Negative

0.862

0.238‒3.126

0.822

Black Iberian pigs

 Giardia duodenalis

Negative

0.125

0.015‒1.036

0.054

 Cryptosporidium spp.

Negative

2.182

0.489‒9.736

0.307

 Blastocystis sp.

Negative

0.163

0.06‒0.421

< 0.001

 Neobalantidium spp.

Negative

0.874

0.336‒2.273

0.783

 Strongyloides spp.

Negative

1.073

0.263‒4.383

0.921

 Type of pig

Sow

2.148

0.851‒5.421

0.105

Wild boars

 Giardia duodenalis

Negative

0.778

0.081‒7.428

0.328

 Cryptosporidium spp.

Negative

1.011

0.1‒10.254

0.313

 Blastocystis sp.

Negative

–

–

–

Neobalantidium spp.

Negative

1.125

0.295‒4.29

0.476

 Strongyloides spp.

Negative

–

–

–

 Sex

Male

2.940

1.028‒8.408

0.034

 Age

Juvenile

1.042

0.335‒3.235

0.356