Table 1.

The Pearson correlation coefficients between outpatient and emergency department visit numbers and input indicators.

Variable	WSa, r	TPb, r	APc, r	RHd, r	PM25e, r	SO2f, r	COg, r	NO2h, r	O3_8hi, r	Number of visits, r
WS	1	–0.32	0.27	–0.4	–0.34	–0.33	–0.26	–0.42	–0.24	0.15
TP	–0.32	1	–0.88	0.35	–0.23	0.03	–0.24	–0.25	0.39	–0.38
AP	0.27	–0.88	1	–0.5	0.31	0.09	0.21	0.29	–0.18	0.39
RH	–0.4	0.35	–0.5	1	–0.18	–0.27	0.2	0.03	–0.28	–0.2
PM25	–0.34	–0.23	0.31	–0.18	1	0.73	0.65	0.81	0.29	0.29
SO2	–0.33	0.03	0.09	–0.27	0.73	1	0.35	0.66	0.43	0.22
CO	–0.26	–0.24	0.21	0.21	0.65	0.35	1	0.68	–0.07	0.35
NO2	–0.42	–0.25	0.29	0.03	0.81	0.66	0.68	1	0.13	0.35
O3_8h	–0.24	0.39	–0.18	–0.28	0.29	0.43	–0.07	0.13	1	–0.14
Number of visits	0.15	–0.38	0.39	–0.2	0.29	0.22	0.35	0.35	–0.14	1

^aWS: wind speed.

^bTP: outside temperature.

^cAP: atmospheric pressure.

^dRH: relative humidity.

^ePM25: particulate matter less than 2.5 μm in diameter.

^fSO₂: sulphur dioxide.

^gCO: carbon monoxide.

^hNO₂: nitrogen dioxide.

ⁱO₃_8h: 8-hour average ozone slip in a day.