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NiSCI scores by SGRQ symptom score at baseline week.
Notes: Values above bars indicate the mean (standard deviation) for each. Error bars represent standard error of the mean. Significance level for comparison: ***P<0.0001; sample median 69.46.
Abbreviations: NiSCI, Nighttime Symptoms of COPD Instrument; SGRQ, St George’s Respiratory Questionnaire; SE, standard error.
