| Code | Description |
|---|
| 1 | Always present (always the same intensity) |
| 2 | Always present (level of pain varies) |
| 3 | Often present (pain free periods last less than 6 hours) |
| 4 | Occasionally present (pain occurs once to several times per day, lasting up to an hour) |
| 5 | Rarely present (pain occurs every few days or weeks) |
| 6 | Pain no longer present (Note: available in follow-up questionnaires only) |