Table 2.

Results of polynomial regression assessing the effect of Date (number of days since January 1), Date² and Head width as a covariate on the probability of being mated for 149 P. downsi females captured between September 2015 and March 2016.

Variable	Coefficient	Standard error	z	p
Intercept	− 9.752	4.674	− 2.086	0.0369
Date	4.081e−2	1.974e−2	2.067	0.0388
Date2	− 7.335e−5	5.579e−5	− 1.315	0.1886
Head width	2.800	1.733	1.965	0.0494