| Grade band | Systems | Students | System-specific school records | Weighted both-wave participation range |
| --- | ---: | ---: | ---: | ---: |
| Grades 4–5 | 9 | 44,325 | 1,440 | 81.3%–91.6% |
| Grades 8–9 | 3 | 16,764 | 555 | 81.6%–86.7% |

*Note.* Schools are counted within systems. Complete system-level counts, jackknife zones, participation patterns, and plausible-value completeness are in Table 1 and `outputs/diagnostics/data_inventory.csv`.
