Table 1. Estimated difference and 95% CI for each hypothesis.

	Estimate	95 LCI	95 UCI
Novel Weapons Hypothesis	−0.14	−0.25	−0.03
Biotic Resistance Hypothesis	0.09	−0.01	0.19
Phylogenetic Distance Hypothesis	−0.22	−0.36	−0.07

Note:

Negative differences were predicted a priori for each hypothesis test.