Table 5.

Correlations between mean monthly meteorological factors and the number of patients with tree pollen allergy

Month	Meteorological factors	No. of patients
		April	May	June	July	Totala
February	Average temperature (°C)	-0.21	0.03	0.56	-0.08	0.06
	Maximum temperature (°C)	-0.14	0.06	0.59	-0.04	0.11
	Minimum temperature (°C)	-0.29	-0.02	0.49	-0.14	-0.01
	Relative humidity (%)	-0.12	-0.007	0.21	-0.26	-0.05
	Precipitation (mm)	0.08	0.24	0.44	0.38	0.30
March	Average temperature (°C)	0.39	0.38	0.37	0.24	0.38
	Maximum temperature (°C)	0.15	0.11	0.05	0.07	0.11
	Minimum temperature (°C)	0.71*	0.76*	0.68*	0.56	0.75*
	Relative humidity (%)	0.63	0.57	0.54	0.25	0.56
	Precipitation (mm)	0.27	0.35	0.60	-0.03	0.33
April	Average temperature (°C)	0.33	0.18	-0.14	0.35	0.21
	Maximum temperature (°C)	0.30	0.14	-0.16	0.24	0.15
	Minimum temperature (°C)	0.23	0.24	-0.02	0.37	0.22
	Relative humidity (%)	0.16	0.29	0.25	-0.10	0.16
	Precipitation (mm)	-0.03	-0.11	-0.12	0.28	-0.005
May	Average temperature (°C)	-	0.54	0.47	0.36	0.5
	Maximum temperature (°C)	-	0.53	0.38	0.34	0.45
	Minimum temperature (°C)	-	0.36	0.45	0.22	0.38
	Relative humidity (%)	-	-0.1	0.03	-0.44	-0.18
	Precipitation (mm)	-	0.26	0.55	-0.01	0.3

Data are Pearson's correlation coefficients. *P < 0.05

^aTotal numbers of patients are the sum of patients with tree pollen allergy from April through July. For meteorological factors in May, total numbers of patients from May to July were used