Baseline characteristics of lung choirs
| Frequency | % | P value | |
| Total | 20 | 100 | |
| Name of choir? | 0.38 | ||
| COPD choir | 10 | 50 | |
| Lung choir | 9 | 45 | |
| Other | 1 | 5 | |
| Setting of choir? | 0.37 | ||
| Local formal music teaching organisation | 14 | 70 | |
| Local informal music teaching organisation | 0 | 0 | |
| Local community health centre | 2 | 10 | |
| Local church | 1 | 5 | |
| Other | 3 | 15 | |
| Time of existence of choir? | 0.37 | ||
| 2 years or less | 6 | 30 | |
| 3 years | 8 | 40 | |
| 4 years | 4 | 20 | |
| 5 years or more | 2 | 10 | |
| No of participants? | 0.36 | ||
| 10 or less | 4 | 20 | |
| 15–20 | 4 | 20 | |
| 20–30 | 8 | 40 | |
| 30 or more | 4 | 20 | |
| How often does the choir rehearse? | 0.38 | ||
| Several times a week | 1 | 5 | |
| Once a week | 11 | 55 | |
| Every other week | 8 | 40 | |
| Duration of choir session? | 0.38 | ||
| 1 hour | 9 | 45 | |
| 1.5 hours | 6 | 30 | |
| 2 hours | 4 | 20 | |
| 3 hours | 1 | 5 | |
| Population density | 0.36 | ||
| Thinly populated area (non-responders) | 9 (5) | 45 | |
| Intermediate density area (non-responders) | 7 (5) | 35 | |
| Densely populated area (non-responders) | 4 (3) | 20 | |
Data are presented as numbers (%), and p values calculated with Pearson χ2 test. All analyses were performed in SPSS V.25.0, .
COPD, chronic obstructive pulmonary disease.