Table 1.

Results from a generalized linear model (GLM) testing the effects of three factors (the number of palps, male body weight before the tests and male post-maturity age) on the exhaustion limits (i.e. endurance). The number of palps was used as a categorical independent variable, while male body weight before the tests and male post-maturity age were used as covariates.

exploratory factorsWald χ2d.f.p-value
number of palps40.0532<0.0001
 full-eunuch (without palps) versus intact (with two palps)39.9781<0.0001
 half-eunuch (with one palp) versus intact (with two palps)8.41510.004
male body weight before the tests5.03910.025
male post-maturity age1.16310.281