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Table 2 Final negative binomial regression model to identify variables with influence on faecal egg counts with cattle in five different study areas in South Darfur State, Sudan, during the rainy season

From: Susceptible trichostrongyloid species mask presence of benzimidazole-resistant Haemonchus contortus in cattle

Term

Estimate

Standard error

Statistic

P value

Risk ratio

95% Confidence interval

Intercept

3.346

0.255

13.142

< 0.0001

28.388

17.591–49.192

Study area: < Ref. Kass

      

Beleil

0.522

0.320

1.631

0.1030

1.686

0.886–3.127

Nyala

0.621

0.304

2.043

0.0411

1.860

1.011–3.296

Rehed Al-Birdi

1.430

0.376

3.799

0.0002

4.177

1.999–8.756

 Tulus

0.786

0.322

2.440

0.0147

2.195

1.110–4.275

Age: Ref.: adult

      

 Young

1.743

0.232

7.524

< 0.0001

5.716

3.640–9.097

Sex: Ref. female

      

 Male

1.634

0.522

3.133

0.0017

5.127

1.997–17.360

Age × sex: Ref: adult; female

      

 Young: male

− 1.623

0.577

− 2.810

0.0050

0.197

0.055–0.564

  1. Nagelkerke R2 = 0.233