Table 7.

Final zero-inflated negative binomial model of the effects of PC. day and their interaction on adult lice counts (N_liceM) (Dataset 2). 2016 omitted due to collinearity

	Coefficient	SE	Z	P > Z	95% CI
Negative binomial portion of model
First PC	1.62	0.16	10.34	0	1.31–1.93
Day	0.19	0.07	2.78	0.01	0.05–0.32
First PC*Day	-0.26	0.09	-2.82	0.01	-0.43– -0.08
Year
2010	-0.71	0.13	-5.62	0	-0.96– -0.47
2011	0.53	0.19	2.87	0	0.17–0.9
2012	-0.98	0.14	-6.96	0	-1.26– -0.71
2013	0.06	0.21	0.26	0.79	-0.37–0.48
2014	-1.71	0.15	-11.62	0	-1.99– -1.42
2015	0.33	0.2	1.68	0.09	-0.06–0.72
Intercept	1.94	0.14	14.31	0	1.67–2.2
Alpha	1.4	0.1			1.23–1.6
Logistic (inflation) portion of model
Day	-1.08	0.23	-4.68	0	-1.53– -0.63
Intercept	-2.92	0.38	-7.73	0	-3.66– -2.18

Abbreviations: CI, confidence interval; SE, standard error