Quality criteria | Specification of scores | Score | |
---|---|---|---|
1 | Study type | Cross-sectional | 0 |
Longitudinal | 1 | ||
2 | Exposure/s | Not clearly reported, no data sources given | 0 |
Clearly reported, with data sources given | 1 | ||
3 | Outcome | Self-reported | 0 |
Objectively measured (at least one timepoint where applicable) | 1 | ||
4 | Sample size | Small (n < 500) or not explicitly reported | 0 |
500–10,000 | 1 | ||
>10,000 | 2 | ||
5 | Completeness of data | Data available for <80% of participants or not reported | 0 |
Data available for ≥80% of participants | 1 | ||
6 | Statistical methods | Not clearly reported | 0 |
Clearly reported | 1 | ||
7 | Confounding | Not controlled for confounders | 0 |
Attempted to control for confounders | 1 | ||
8 | Descriptive data | Not clearly reported | 0 |
Clearly reported | 1 | ||
9 | Clear presentation of results of associations of interest | No table listing results and significance | 0 |
Table listing results and significance | 1 | ||
Total (highest possible) | 10 |