Table 1. Post-hoc pairwise comparisons using chi-squared tests for given probabilities (0.25) of each of the four foods consumed first across the food preference trials.
| Food | Frequency of being consumed first | Expected frequency | Chi-square value | P value |
|---|---|---|---|---|
| Day 5 trial | ||||
| Bread | 0 | 6.25 | 8.33 | 0.016 |
| Cat food | 3 | 6.25 | 2.25 | 0.53 |
| Fish | 17 | 6.25 | 24.65 | <0.001 |
| Mussels | 5 | 6.25 | 0.33 | 1 |
| Day 10 trial | ||||
| Bread | 1 | 6.5 | 6.21 | 0.051 |
| Cat food | 2 | 6.5 | 1.28 | 1 |
| Fish | 13 | 6.5 | 8.67 | 0.013 |
| Mussels | 8 | 6.5 | 0.46 | 1 |
| Day 15 trial | ||||
| Bread | 2 | 6 | 3.56 | 0.24 |
| Cat food | 1 | 6 | 5.56 | 0.074 |
| Fish | 12 | 6 | 8 | 0.019 |
| Mussels | 9 | 6 | 2 | 0.63 |
| Day 35 trial | ||||
| Bread | 0 | 3.25 | 4.33 | 0.015 |
| Cat food | 2 | 3.25 | 0.64 | 1 |
| Fish | 8 | 3.25 | 9.25 | 0.009 |
| Mussels | 3 | 3.25 | 0.03 | 1 |
Note:
Significant terms (P value < α = 0.05) are highlighted in bold.