Different versions of the Health Assessment Questionnaire (HAQ) in the Netherlands
| Categories | Items | Aid/devices | |
| Siegert (1984) | 8 | 24 | No |
| Van der Heijde (1990, HAQ90) | 9 | 23 | No1-150 |
| New version (1999, HAQ99) | 8 | 20 | Yes |
The original Stanford HAQ contains 20 items in eight categories and includes a section to correct for the use of aid/devices.
↵1-150 No section on aid/devices but to each of the 23 items an option was added for this purpose.