Methacholine challenge A numerically higher proportion of smokers reacted to methacholine (ie, PD20 of 5.96 mg or less) compared to non-smokers (60% versus 30%) with a trend towards increased BHR in smokers that did not reach statistical significance (p = 0.07) ( Figure 2 , Table 1 ).
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0.0700
0.0700
The sentences
Indeed in COPD patients a similar relationship was observed between EBC pH and sputum neutrophilia ( Kostikas et al 2002 ), although in our study this relationship failed to reach statistical significance.
Pizzichini et al showed a trend towards increased neutrophilia in smokers with non-obstructive chronic bronchitis and predominant neutrophilia in established COPD ( Pizzichini et al 1996 ).