Table 2 Logistic regression analyses: regression equation is Y = β₀ + β₁ + β₂

5A vs. 82B→5A

Y = 0.66 - 0.49^Hd

P = 0.02

5A vs. A1A→5A

Y = -0.57 - 1.73^Hd

P = 0.0001

5A vs. A2F→5A

Y = -0.57 - 1.72^Hd

P = 0.0001

A2E vs. 82B→A2E

Y = 0.69 - 0.90^Hd

P = 0.001

B. Variation in resistance among H. defensa strains in common background 5A

A2F vs. 82B vs. A1A

Y = -1.13 + 1.3^82B -0.16^A1A

P = 0.001

C. effects of superparasitism on rates of successful parasitism

Assay

Regression equation

P- value

5A (uninfected)

Y = 1.28 + 0.13^DP

P = 0.57

82B→5A (H. defensa + APSE-2)

Y = 1.44 + 1.27^DP

P = 0.001

A1A→5A (H. defensa + APSE-3)

Y = -1.34 + 0.97^DP

P = 0.0005

A2F→5A (H. defensa + APSE-3)

Y = -1.55 + 0.73^DP

P = 0.004

A2E (uninfected)

Y = 2.54 + 0.94^DP

P = 0.01

82B→A2E (H. defensa + APSE-2)

Y = 0.34 + 0.55^DP

P = 0.008

All treatments

Y = 0.35 + 0.40^DP

P < 0.0001

All H. defensa-infected

Y = -0.26 + 0.46^DP

P < 0.0001

All uninfected

Y = 1.71 + 0.32^DP

P = 0.07