Table 1. Characteristics of the included instruments (n = 92).
| Characteristic | No. of instruments (%) |
|---|---|
| Creator/developer | |
| Authors | 64 (70) |
| Organizations | 28 (30) |
| .org | 14 |
| .com | 1 |
| .edu | 5 |
| .gov | 5 |
| .eu | 3 |
| Target website | |
| Health care-specific websites or websites in generala | 83 (90) |
| Disease-specific | 9 (10) |
| Alzheimer disease | 1 |
| Neuropathology | 1 |
| Female urinary incontinence | 1 |
| Multiple sclerosis evaluation instrument | 1 |
| Diabetes | 1 |
| Breastfeeding | 1 |
| Hypoactive sexual desire disorder | 1 |
| Vaccination | 1 |
| Bipolar disorder | 1 |
| Target audience | |
| General population | 90 (98) |
| Low literacy | 1 (1) |
| Elderly | 1 (1) |
| Domain of interest | |
| More than one domain or item | 83 (90) |
| Usability | 3 (3) |
| Accessibility | 3 (3) |
| Technical elements (privacy) | 2 (2) |
| Design of interface | 1 (1) |
| Instrument validation | |
| Not validated | 56 (61) |
| Validated | 28 (30) |
| Not reported | 8 (9) |
aNine of these instruments did not not have any specific name. In S2 Table, we refer to them by the author’s name.