| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| case control nejm | 1.88 | 0.6 | 4524 | 48 | 17 |
| case | 0.4 | 0.4 | 2233 | 1 | 4 |
| control | 1.25 | 0.8 | 1236 | 60 | 7 |
| nejm | 0.58 | 0.3 | 2018 | 20 | 4 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| case control nejm | 1.35 | 0.6 | 4958 | 25 |
| case control nested in cohort study | 1.89 | 0.6 | 7049 | 91 |
| nested case control vs case cohort study | 1.56 | 0.8 | 5925 | 78 |
