Table 1.

Behavioural variable coefficients retained in the most parsimonious forward-conditional logistic regression model derived from 78 crowd-reared and 78 third-generation isolated-reared fifth-instar C. terminifera locusts. (Negative coefficients indicate that the magnitude of response was greater in crowd-reared (gregarious) as opposed to solitary-reared (solitarious) individuals. The Wald statistic indicates the significance of variable contributions to the model. The Hosmer and Lemeshow goodness-of-fit test was not significant (p=0.859, d.f.=8). (Model: η=β₀+β₁X₁+β₂X₂+⋯+β_kX_k, with P_solitarious=e^η/(1+e^η).))

variable	coefficient β	coefficient β, s.e.	Wald statistic	significance of Wald statistic
average distance to the stimulus chamber	0.438	0.155	7.956	0.005
distance moved	−0.054	0.019	8.147	0.004
climb time	−0.074	0.27	7.523	0.006
constant	−0.359	1.32	0.074	0.785