Table 3.

Variables of the Cox proportional hazards model on the effect of population (covariate) on the duration of total immature development (egg–adult) of six medfly populations reared on an artificial diet in the laboratory (25°C). Individuals from Kenya form the baseline

Source of variation	β	SE	Exp(β)	P
Populations				<0.001
Portugal	−1.905	0.127	0.149	<0.001
Greece	−2.277	0.130	0.103	<0.001
Hawaii	−1.708	0.124	0.181	<0.001
Brazil	−1.520	0.122	0.219	<0.001
Guatemala	−2.989	0.133	0.050	<0.001