Table 1: Indicator Variables for Local Anesthesia Treatments
| Variable | Value | Local Anesthesia Administered if Value = 1 |
| S0 | 0 or 1 | None |
| S1 | 0 or 1 | Bupivacaine |
| S2 | 0 or 1 | Lidocaine |
| S3 | 0 or 1 | Ropivacaine |
| S1S2 | 0 or 1 | Bupivacaine, Lidocaine |
| S1S3 | 0 or 1 | Bupivacaine, Ropivacaine |
| S2S3 | 0 or 1 | Lidocaine, Ropivacaine |
| S1S2S3 | 0 or 1 | Bupivacaine, Lidocaine, Ropivacaine |