Table 2 Inclusion and exclusion criteria for selection of studies
Inclusions criteria | Exclusions criteria |
|---|---|
1. Studies on assessing the estimation of LDL-c using equations | 1. Studies not reporting on the assessment of LDL-c equations |
2. Evaluation studies where direct LDL-c was used as the reference standard | 2. Evaluation studies where direct LDL-c was not used as a reference standard |
3. Studies published in or after the year 2001 | 3. Studies published before 2001 |
4. Articles published in the English language | 4. Articles unavailable in the English language |
5. Journal articles | 5. Non-journal articles |
6. Primary research studies (both quantitative and qualitative studies) | 6. Non-primary research studies such as literature reviews and systematic reviews |
7. Studies related to estimating patient’s quality of life | 7. Studies not related to patient’s quality of life |
8. Full-text articles available | 8. Full-text articles unavailable |
9. Primary studies with abstracts (method comparison and validation studies) | 9. Primary studies without Abstract |
10. Studies that reported on other LDL-c equations other than only the Friedewald’s equation | 10. Studies that assessed only the Friedewald’s LDL-c equation |