Table 2. Trends Over Study Period.

	2009	2010	2011	2012	2013	p-value
PresentProp	1.13%	1.33%	1.24%	1.56%	1.69%	*p=0.004
Mean LOS in hours (SD)	6.7 (7.7)	8.3 (16.2)	8.0 (15.1)	11.2 (20.1)	20.8 (32.3)	*p=0.0367
Median Charges in dollars (IQR)	1128 (736-1688)	1137 (683 – 1688)	1186 (900 – 1688)	1292 (779 – 1817)	1335 (821 – 1834)	*p=0.011

PresentProp: proportion of mental health presentations out of overall PED volume; LOS: length of stay; IQR: inter-quartile range

^*P-values were obtained from the multiple regression models after adjusting for patient and ED level confounding variables. For proportion of mental health presentations, a Poisson regression was used. For LOS, a linear mixed effects model was used; and for charges, a lognormal mixed effects model was used.