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Table 2 Results of logistic regression analysis of predatory responses of female Latrodectus hesperus to playbacks of low- or high-amplitude vibrations of house fly prey and conspecific males

From: A meal or a male: the ‘whispers’ of black widow males do not trigger a predatory response in females

Model

- LogLikelihood

DF

χ2

p

Difference

9.381

3

18.762

0.0003

Full

32.959

   

Reduced

42.340

   

R2 (U)

0.222

   

Predictor

β

SE β

χ 2

p

Odds ratio

Constant

- 0.713

0.325

4.82

0.028

N/A

Amplitude

1.233

0.325

14.41

0.0001

1.308

Waveform

- 0.134

0.325

0.17

0.679

0.085

Amplitude*Waveform

- 0.134

0.325

0.17

0.679

N/A

  1. (The levels of the factors amplitude and waveform were coded as follows: low = 0, high = 1; male = 0, prey = 1).