| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| endogenous opioids definition | 0.16 | 0.2 | 550 | 76 | 29 |
| endogenous | 0.06 | 0.4 | 3673 | 14 | 10 |
| opioids | 1.82 | 1 | 1687 | 86 | 7 |
| definition | 0.93 | 0.7 | 4794 | 56 | 10 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| endogenous opioids definition | 0.07 | 0.2 | 3634 | 11 |
