Table 2.
Distribution of Aflatoxin M1 concentration (ng kg−1) in different milk types and in various geographical areas of Italy during the 5.5-year period.
| OM1 Northern Italy | AQM2 Northern Italy | AQM2 Central Italy | AQM2 Southern Italy | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of samples | 1,869 | 20,574 | 2,438 | 6,821 | ||||||||
| Confidence intervals | 95% CI | (LCL-UCL) | 95% CI | (LCL-UCL) | 95% CI | (LCL-UCL) | 95% CI | (LCL-UCL) | ||||
| Mean concentration | 10.3 | 9.9 | 10.6 | 12.6 | 12.5 | 12.7 | 13.3 | 12.9 | 13.6 | 11.4 | 11.3 | 11.6 |
| SD | 7.7 | 8.5 | 8.6 | 7.5 | ||||||||
| Median | 8 | 8 | 9 | 10 | 10 | 11 | 11 | 11 | 11 | 9 | 9 | 10 |
| P0.90 | 18 | 17 | 20 | 23 | 23 | 23 | 24 | 24 | 26 | 21 | 20 | 21 |
| P0.95 | 24 | 23 | 27 | 28 | 28 | 29 | 30 | 29 | 33 | 26 | 25 | 27 |
| P0.975 | 30 | 29 | 33 | 34 | 34 | 35 | 38 | 35 | 40 | 32 | 30 | 33 |
| P0.99 | 41 | 36 | 49 | 41 | 40 | 41 | 43 | 41 | 46 | 40 | 38 | 40 |
| Weighted mean concentration | 10.8 | 10.4 | 11.1 | 12.6 | 12.5 | 12.6 | 13.4 | 13.0 | 13.7 | 11.7 | 11.6 | 11.9 |
The percentile values (P0.90–P0.99) were calculated with the NIST method; LCL and UCL are the lower and upper 95% confidence intervals (CI).
1
Organic milk.
2
Average quality milk.