RESULTS	On average , patients with early rehabilitation ( n = 19 ) had 2.61 ( SD 2.96 ) exacerbations requiring systemic corticosteroids and/or antibiotics , compared to 2.77 ( SD 3.41 ) in patients with late rehabilitation ( adjusted incidence rate ratio 0.83 , 95 % confidence interval 0.43-1 .63 ; p = 0.60 ) .\