| Value | Category | 
|---|---|
| -9 | Don't know | 
| -7 | Legal skip | 
| -6 | Unfinished questionnaire | 
| -3 | Interviewer error | 
| 0 | the chronic illness did not prevent the respondent from carrying out all usual activities during the last 4 weeks | 
| 1 | |
| 2 | |
| 3 | |
| 4 | |
| 5 | |
| 7 | |
| 8 | |
| 10 | |
| 12 | |
| 14 | |
| 15 | |
| 18 | |
| 20 | |
| 21 | |
| 22 | |
| 25 | |
| 28 |