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Table 3 Independent variables used in logistic regression modeling durum wheat incidence and severity and likelihood ratio test (LRT) for nine variables as single predictors of disease outcome

From: Epidemiological factors of septoria tritici blotch (Zymoseptoria tritici) in durum wheat (Triticum turgidum) in the highlands of Wollo, Ethiopia

Independent variable

df

Septoria tritici blotch incidence LRT > 50%

Septoria tritici blotch severity LRT > 25%

DR

Pr > χ2

DR

Pr > χ2

District

4

534.21

< .0001

356.02

< .0001

Altitude

1

128.55

< .0001

6.10

0.0135

Variety

10

931.59

< .0001

372.15

< .0001

Growth stage

3

53.77

< .0001

16.18

0.001

Plant population

2

474.36

< .0001

165.41

< .0001

Planting date

4

33.04

< .0001

15.49

0.0038

Previous crop

3

222.05

< .0001

181.28

< .0001

Weed population

2

13.88

0.001

32.06

< .0001

Soil type

2

59.69

< .0001

11.45

0.0033

  1. df degrees of freedom, DR deviance reduction, Pr probability of a χ2 value exceeding the deviance reduction