Table 3.
Characteristics of Articles Included in Phase II
| Study Characteristics | Values |
|---|---|
| Articles, number | 46 |
| Publication year, range | 1985-2019 |
| ALS-sample size per study, range | 5-274 |
| Mean age (year) of ALS patients, range | 50.7 – 68.5 |
| Recruitment setting, number of articles | |
| Hospital or clinical | 40 |
| Register data | 2 |
| Others | 4 |
| Continent, number of articles | |
| America | 14 |
| Asia | 6 |
| Europe | 22 |
| Oceania | 4 |
| Study design, number of articles | |
| Cross sectional | 38 |
| Longitudinal | 8 |
| Cohort study | 3 |
| Case-control | 19 |
| Diagnostic | 22 |
| Combination of designs | 2 |
| Psychometrics, number of articles | |
| Internal consistency | 9 |
| Reliability | 5 |
| Content validity | 1 |
| Construct validity – structural validity | 4 |
| Construct validity - hypothesis testing | 28 |
| Criterion validity | 29 |
| Responsiveness | 3 |
| Feasibility | 5 |
Abbreviation: ALS, amyotrophic lateral sclerosis.