TABLE 2.
Extraction efficiency for environmental samples
| Shellfish | No. of samples collected | No. of samples with indicated extraction efficiency quality (%) |
No. of samples considered | Avg extraction efficiency ± SD | ||
|---|---|---|---|---|---|---|
| Acceptable (>5) | Poor (≤5) | Poor with repeated extractions (≤5)a | ||||
| Clams | 67 | 51 | 16 | 2 | 65 | 24 ± 12 |
| Cockles | 52 | 42 | 10 | 3 | 49 | 13 ± 6 |
| Mussels | 94 | 90 | 4 | 0 | 94 | 30 ± 14 |
| Oysters | 73 | 57 | 16 | 7 | 66 | 26 ± 19 |
| Total | 286 | 240 | 46 | 12 | 274 | |
a
Data represent samples for which repeated extractions (2 or 3) presented low extraction efficiencies and thus were not considered.