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Table 3 Results of overdispersed Poisson log-linear regression evaluating seasonal incidence of methicillin-resistant Staphylococcus aureus, Stenotrophomonas maltophilia, Achromobacter xylosoxidans and Haemophilus influenzae acquisition among young U.S. children with cystic fibrosis, 2003 to 2009

From: Seasonality of acquisition of respiratory bacterial pathogens in young children with cystic fibrosis

  Respiratory Pathogen
MRSA S. maltophilia A. xylosoxidans H. influenzae
IRR
(95% CI) 		IRR
(95% CI) 		IRR
(95% CI) 		IRR
(95% CI)
Winter 1.0
Referent 		1.0
Referent 		1.0
Referent 		1.0
Referent
Spring 0.79*
(0.65, 0.96) 		0.91
(0.76, 1.08) 		0.59*
(0.39, 0.89) 		0.92
(0.81, 1.04)
Summer 0.69*
(0.57, 0.84) 		1.05
(0.89, 1.25) 		0.69
(0.47, 1.01) 		0.88*
(0.78, 0.99)
Autumn 0.89
(0.75, 1.07) 		0.95
(0.80, 1.12) 		0.80
(0.56, 1.15) 		0.78*
(0.69, 0.88)
  1. MRSA, methicillin-resistant Staphylococcus aureus; S. maltophilia, Stenotrophomonas maltophilia; A. xylosoxidans, Achromobacter xylosoxidans; H. influenzae, Haemophilus influenzae; IRR, incidence rate ratio; CI, confidence interval
  2. * P < 0.05
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