| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| when did polio vaccinations begin | 0.97 | 0.4 | 3399 | 91 | 33 |
| when | 1.29 | 0.2 | 8673 | 55 | 4 |
| did | 0.87 | 0.5 | 9371 | 85 | 3 |
| polio | 0.45 | 0.4 | 2133 | 12 | 5 |
| vaccinations | 0.98 | 0.6 | 7462 | 39 | 12 |
| begin | 1.02 | 0.5 | 4204 | 82 | 5 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| when did polio vaccinations begin | 1.97 | 0.6 | 3754 | 87 |
