Enrichment Factor (EF) | Categories |
EF < 2 | Deficiency to minimal enrichment |
2 ≤ EF < 5 | Moderate enrichment |
5 ≤ EF < 20 | Significant enrichment |
20 ≤ EF < 40 | Very high enrichment |
EF ≥ 40 | Extremely high enrichment |