Table 3.

The relative risk of viral infection of children and COPD admission.

Predictor	Poisson regression coefficient
	Relative risk (95% confidence interval)
	Same week	1 weeks time	2 weeks time
Virus total	1.09 (0.95, 1.26)	1.11 (0.96, 1.28)	1.11 (0.96, 1.28)
Respiratory syncytial virus	1.17 (1.05, 1.31)**	1.15 (1.02, 1.29)*	1.18 (1.05, 1.33)**
Influenza A	1.25 (1.11, 1.40)***	1.14 (1.01, 1.29)*	1.18 (1.05, 1.33)**
Influenza B	1.27 (1.03, 1.57)*	1.20 (0.97, 1.49)	1.20 (0.97, 1.49)
Adenovirus	1.20 (1.05, 1.36)**	1.02 (0.89, 1.17)	1.07(0.94, 1.22)
Parainfluenza 1	1.01 (0.86, 1.18)	1.05 (0.90, 1.23)	1.05 (0.90, 1.23)
Parainfluenza 2	0.93 (0.65, 1.35)	0.96 (0.67, 1.38)	0.80 (0.54, 1.19)
Parainfluenza 3	0.93 (0.81, 1.06)	0.90 (0.79, 1.02)	0.94 (0.84, 1.08)

${}^{*}P<0.05$; ${}^{**}P<0.01$; ${}^{***}P<0.001$.

This table illustrates Poisson regression coefficients for relative risk of COPD admission per week (as well as the following 2 weeks) with respect to the detection of the named respiratory viruses.