Long-Term Prediction of Emergency Department Revenue and Visitor Volume Using Autoregressive Integrated Moving Average Model

Table 2

Spearman correlation between ED revenue, trauma, nontrauma, and pediatric visits and related variables (January, 2005–December, 2008).

Variable	ED revenue		Trauma visit		Nontrauma visit		Pediatric visit
	Coefficient 95% CI	Lag values	Coefficient 95% CI	Lag values	Coefficient 95% CI	Lag values	Coefficient 95% CI	Lag values
Mean maximum temperature	0.38 (0.33, 0.43)**	1 month	−0.22 (−0.37, −0.07)*	0 month	0.45 (0.37, 0.53)**	1 month	0.31 (0.23,0.38)**	1 month
Mean minimum temperature	−0.45 (−0.51, −0.39)**	1 month	0.41 (0.31, 0.52)**	1 month	−0.33 (−0.45, −0.22)*	1 month	−0.38 (−0.45, −0.32)**	1 month
Relative humidity	0.48 (0.40, 0.56)**	0 month	−0.52 (−0.70, −0.35)*	1 month	0.23 (0.06, 0.39)*	0 month	0.34 (0.20, 0.57)*	1 month
Accumulated rainfall	0.47 (0.38, 0.56)**	2 month	0.28 (0.11, 0.46)*	1 month	0.12 (0.01, 0.22)*	1 month	0.23 (0.10, 0.36)*	2 month
Stock index fluctuation	0.18 (−0.03, 0.39)*	1 month	0.30 (0.20, 0.39)**	2 month	0.27 (0.20, 0.34)**	1 month	0.44 (0.30, 0.59)*	1 month

* 𝑃<0.05, **𝑃<0.01, statistically significant.