Table 3.
Quality of the articles included, according to the Newcastle–Ottawa Quality Assessment Scale.
| Authors | Sample representativeness | Justified sample sizea | Rate of non-responses | Exposure assessment | Comparability | Assessment of results | Appropriate statistical test | Final assessmentb |
|---|---|---|---|---|---|---|---|---|
| McNerney, Coad, Burkard (2014)26 | Non-representative (0) | Yes (1) | 0% (1) | Validated tool (2) | Yes (2) | Study's own report (1) | Yes (1) | 8/10 |
| Sousa, Suzuki (2014)27 | Non-representative (0) | No (0) | 0% (1) | Validated tool (2) | Yes (2) | Study's own report (1) | Yes (1) | 7/10 |
a
Minimum criterion of n ≥ 30 (central limit theorem).
b
Maximum score of 10 stars. Result presented as: points obtained/maximum score.