Table 4.
Observed and predicted TTD of SEA under combined conditions for internal validation.
| T (°C) | Inoculation level (SD) (log CFU/g) | Obs (corrected TTD) (SD) (h) | Pred (h) | |
|---|---|---|---|---|
| Linear polynomial regression | Threshold method | |||
| 15 ± 1 | 2.51 (0.01) | nd | 44.68 | uc |
| 15 ± 1 | 3.59 (0.04) | nd | 29.83 | uc |
| 15 ± 1 | 4.42 (0.02) | nd | 18.67 | uc |
| 22 ± 1 | 2.51 (0.01) | 36.55 (0.18) | 35.58 | 38.60 |
| 22 ± 1 | 3.59 (0.04) | 24.94 (0.15) | 25.35 | 26.53 |
| 22 ± 1 | 4.42 (0.02) | 17.20 (0.19) | 17.76 | 19.24 |
| 29 ± 1 | 2.51 (0.01) | 21.58 (0.13) | 23.42 | 19.63 |
| 29 ± 1 | 3.59 (0.04) | 18.41 (0.15) | 17.82 | 16.58 |
| 29 ± 1 | 4.42 (0.02) | 15.02 (0.11) | 13.78 | 13.24 |
| 36 ± 1 | 2.51 (0.01) | 9.05 (0.07) | 8.18 | 9.56 |
| 36 ± 1 | 3.59 (0.04) | 7.03 (0.05) | 7.21 | 8.36 |
| 36 ± 1 | 4.42 (0.02) | 6.04 (0.09) | 6.73 | 5.02 |
nd, no SEA was detected; uc, uncalculated using the threshold method.