| PID | pain intensity difference [score]; pelvic inflammatory disease; photoionization detector; picture im... |
|---|---|
| PPID | peak pain intensity difference [score] |
| PRI(S) | pain rating intensity score |
| RTS | real time scan; Rett syndrome; revised trauma score; right toestrike; Rothmund-Thomson syndrome; Rub... |
| SDS | same day surgery; school dental services; self-rating depression scale; sensory deprivation syndrome... |