The Generalized Anxiety Disorder (GAD) questionnaire (Spitzer et al., 2006) is a 7-item scale designed to measure generalised anxiety disorder. Different versions of the scale have been created which include a subset of the original 7 items.
| Question number | Question | Original 7-item version | GAD-21 |
| 1 | Over the last 2 weeks, how often have you been bothered by the following problems? Feeling nervous, anxious, or on edge | ✓ | ✓ |
| 2 | Over the last 2 weeks, how often have you been bothered by the following problems? Not being able to stop or control worrying | ✓ | ✓ |
| 3 | Over the last 2 weeks, how often have you been bothered by the following problems? Worrying too much about different things | ✓ | |
| 4 | Over the last 2 weeks, how often have you been bothered by the following problems? Having trouble relaxing | ✓ | |
| 5 | Over the last 2 weeks, how often have you been bothered by the following problems? Being so restless that it is hard to sit still | ✓ | |
| 6 | Over the last 2 weeks, how often have you been bothered by the following problems? Becoming easily annoyed or irritable | ✓ | |
| 7 | Over the last 2 weeks, how often have you been bothered by the following problems? Feeling afraid as if something awful might happen | ✓ |