| Value |
Category |
| 0 |
Missing/Refused/NAD |
| 1 |
Almost every month |
| 2 |
Some months not all |
| 3 |
Only once or twice |
| 4 |
None |
| Sysmiss |
|
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.