| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| sample size for retrospective study | 0.97 | 0.2 | 7552 | 71 | 35 |
| sample | 0.99 | 0.8 | 9299 | 79 | 6 |
| size | 1.74 | 0.7 | 7597 | 73 | 4 |
| for | 0.65 | 0.1 | 4639 | 9 | 3 |
| retrospective | 0.8 | 0.7 | 172 | 56 | 13 |
| study | 1.04 | 0.5 | 3911 | 34 | 5 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| sample size for retrospective study | 0.78 | 0.9 | 8545 | 45 |
