Confusion matrix for the regular expression (RE)-based diagnosis classification algorithm*
| Classified by the RE algorithm | Classified by manual prescriptions review | ||||
| Tier 1A | Tier 1B | Tier 2A | Tier 2B | Tier 3 | |
| Tier 1A | 348 | 0 | 0 | 0 | 0 |
| Tier 1B | 1 | 41 | 0 | 0 | 0 |
| Tier 2A | 2 | 1 | 1074 | 0 | 0 |
| Tier 2B | 0 | 0 | 4 | 63 | 0 |
| Tier 3 | 4 | 0 | 17 | 1 | 8428 |
*Tier 1A: tier 1 diagnoses without uncertainty. Tier 1B: tier 1 diagnoses with uncertainty. Tier 2A: tier 2 diagnoses without uncertainty. Tier 2B: tier 2 diagnoses with uncertainty.