Table 3

Spearman's correlation coefficients for association between monthly number of different viral infections and meteorological factors

Virus

Relative humidity (%)^a

Temperature (°C)^a

Rainfall (mm)^b

RSV

0.40 (P = 0.015)

-0.058 (P = 0.74)

-0.061 (P = 0.72)

Influenza A

0.023 (P = 0.89)

-0.034 (P = 0.084)

-0.12 (P = 0.47)

PIV type 3

-0.088 (P = 0.61)

0.65 (P <0.0001)

0.68 (P <0.0001)

PIV type 1

-0.38 (P = 0.024)

0.17 (P = 0.31)

0.23 (P = 0.18)

Influenza B

-0.34 (P = 0.045)

-0.31 (P = 0.066)

-0.39 (P = 0.019)

hMPV

0.55 (P = 0.0005)

-0.15 (P = 0.37)

0.022 (P = 0.90)

PIV type 2

0.15 (P = 0.39)

0.39 (P = 0.019)

0.30 (P = 0.078)

^aMean daily measurement for the month; ^btotal measurement for the month.

hMPV = human metapneumovirus; PIV = parainfluenza virus; RSV = respiratory syncytial virus.

Mathisen et al. BMC Medicine 2009 7:35   doi:10.1186/1741-7015-7-35