Table 2.

Correlation between the climatic conditions and the amount of Legionella DNA^a

	Air temperature (mean, °C)		Relative humidity (mean, %)		Total precipitation (mm)		Wind speed (mean, m/s)
	r	P	r	P	r	P	r	P
Daily value (N = 114):
on the sampling day (lag day 0)	−0.10	0.22	0.13	0.11	0.17	0.04c	−0.10	0.22
one day before the sampling day (lag day 1)	0.01	0.90	−0.19	0.02c	−0.29b	< 0.01c	0.16	0.049c
two days before the sampling day (lag day 2)	−0.07	0.39	−0.15	0.06	0.12	0.16	0.08	0.34
three days before the sampling day (lag day 3)	−0.10	0.24	−0.01	0.90	−0.11	0.17	−0.15	0.06
four days before the sampling day (lag day 4)	−0.06	0.48	0.03	0.74	0.02	0.85	−0.19	0.02c
five days before the sampling day (lag day 5)	−0.09	0.29	−0.05	0.53	−0.06	0.45	−0.08	0.35
six days before the sampling day (lag day 6)	−0.11	0.17	0.04	0.65	−0.09	0.28	0.07	0.39
seven days before the sampling day (lag day 7)	−0.13	0.12	0.14	0.09	0.21b	0.01c	−0.07	0.37
Monthly value (N = 17)	−0.08	0.35	0.08	0.34	0.56b	< 0.01c	−0.04	0.63

^aGeometric mean (log₁₀ copies/m³) of Legionella-specific 16S rRNA genes in the Legionella DNA-positive samples.

^bAn absolute Pearson’s r value ≥ 0.20 was considered to be correlated.

^cP < 0.05 was considered significant.