Table 1.
Study characteristics of the included articles (n = 308)
| Study characteristics | n | % |
|---|---|---|
| Age groups | ||
| Adults; ≥ 18 years | 266 | 86.4 |
| Children; < 18 years | 8 | 2.6 |
| All ages | 26 | 8.4 |
| Not reported | 8 | 2.6 |
| Sample sizes | ||
| ≤ 100 | 81 | 26.3 |
| 101–499 | 134 | 43.5 |
| ≥ 500 | 90 | 29.2 |
| Not reported | 3 | 1.0 |
| Study settings | ||
| Communitya | 109 | 35.4 |
| Health care facilitiesb | 96 | 31.2 |
| Telephone and web | 28 | 9.1 |
| Schools and universities | 15 | 4.9 |
| Multiple settings | 42 | 13.6 |
| Not reported | 18 | 5.8 |
| Study population | ||
| Patients | 120 | 39.0 |
| General population | 114 | 37.0 |
| Patients and othersc | 32 | 10.4 |
| Children, parents and othersd | 26 | 8.4 |
| Other populationse | 14 | 4.5 |
| Not reported | 2 | 0.6 |
| Mode of administration | ||
| Interview | ||
| Face-to-face interview | 136 | 44.2 |
| Computer-assisted interview | 13 | 4.2 |
| Web-based interview | 3 | 1.0 |
| Telephone interview | 4 | 1.3 |
| Self-administered questionnaire | ||
| Questionnaire (without specification) | 74 | 24.0 |
| Web-based questionnaire | 31 | 10.1 |
| Mailed questionnaire | 19 | 6.2 |
| Computer-based questionnaire | 12 | 3.9 |
| Panel session | 1 | 0.3 |
| Secondary data | 1 | 0.3 |
| Mixed modes of administration | 9 | 2.9 |
| Not reported | 5 | 1.6 |
| VAS combined with other valuation methods | ||
| No other methods | 96 | 31.2 |
| One other method | ||
| TTO | 89 | 28.9 |
| SG | 39 | 12.7 |
| DCE | 3 | 1.0 |
| Ranking | 2 | 0.6 |
| WTO | 1 | 0.3 |
| Thurstone | 1 | 0.3 |
| More than one other method | 77 | 25.0 |
DCE discrete choice experiment, SG standard gamble, TTO time trade-off, VAS visual analogue scale, WTO waiting trade-off
aIncluded communities, homes and offices
bIncluded hospitals, clinics, medical centres, primary care centres, nursing homes and laboratories
cIncluded general population, health care personnel, health individuals, partners, proxies, caregivers, family members, and students
dIncluded healthcare personnel, healthy individuals, general population, teachers and students