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Table 1

From: Randomised, controlled trial of N-acetylcysteine for treatment of acute exacerbations of chronic obstructive pulmonary disease [ISRCTN21676344]

  Likert Scale for Breathlessness
1 Extremely short of breath
2 Very short of breath
3 Quite a bit short of breath
4 Moderate shortness of breath
5 Some shortness of breath
6 A little shortness of breath
7 Not at all short of breath