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. Author manuscript; available in PMC: 2012 May 24.
Published in final edited form as: N Engl J Med. 2011 Nov 24;365(21):1990–2001. doi: 10.1056/NEJMoa1104647

Figure 2. Exacerbations of Wheezing and Respiratory Tract Illness.

Figure 2

P values are based on exact Wilcoxon–Mann–Whitney tests for Panels A and C and on Wald tests from a proportional-hazards regression model for Panels B and D. All comparisons have been adjusted for clinical center and age.