Quality assessment criteria for criterion-related validity studies
| Grading system parameter | Grade | Criterion |
|---|---|---|
| Number of study subjects | 0 | n(10 |
| 1 | n = 11–50 | |
| 2 | n≥51 | |
| Description of the study population with respect to age, sex, health status, fitness levels, pubertal status, ethnicity, physical activity patterns, body composition, etc. | 0 | Less items than required for grade 1 |
| 1 | At least age, sex, health status and fitness levels | |
| 2 | More items than required for grade 1 | |
| Statistical analysis included in the study | 0 | Those not included in 1 |
| 1 | Error indexes or regression analysis | |
| 2 | ≥3 items or Bland–Altman plot and/or ANOVA for repeated measurements |
Rating for total score: high quality=5–6 low quality=3–4 very low quality=0–2