What were the top four psychological symptoms reported by this group of COPD patients? What percentage of these people had these symptoms? Was there a significant difference in psychological symptoms between the moderate and severe airway limitation groups?

What was the percentage of the total sample that used short-acting Î2 2 -agonists? Display your calculations and round to the nearest whole percentage point.

Is there a significant difference in the use of short-acting Î2 2 -agonists between the moderate and severe airway limitation groups? Give a reason for your answer.

Was the percentage of COPD patients who used short-acting Î2 2 -agonists who had moderate or severe airway limitation what you expected? Give a rationale and supporting documentation for your answer.