Table 2. Summary of the regression results for Perceived Calorie content of food items (n = 253).
| Perceived calorie content | |||||
|---|---|---|---|---|---|
| Variable (unit) | Mean (s.e.m.) | Beta | Student’s t | p-value | Bootstrapped p-value |
| Red brightness | 217.6 (1.4) | 0.044 | 1.187 | 0.236 | 0.219 |
| Green brightness | 198.2 (1.5) | −0.102 | −1.970 | 0.050 | 0.040 |
| Blue brightness | 172.8 (1.9) | 0.032 | 0.643 | 0.521 | 0.500 |
| High frequency power | 0.0046 (0.0002) | −0.023 | −0.732 | 0.465 | 0.386 |
| Stimulus size | 53%(1%) | 0.010 | 0.271 | 0.786 | 0.761 |
| Calorie content | 193.9 (9.9) | 0.327 | 9.819 | 0.000 | 0.001 |
| Level of transformation (arbitrary)b | 38.8 (1.8) | 0.699 | 18.642 | 0.000 | 0.001 |
| Work for preparation (arbitrary)b | 20.7 (1.0) | 0.052 | 1.835 | 0.068 | 0.044 |
| BMI (average) | 22 (0.02) | −0.001 | −0.020 | 0.984 | 0.981 |
| AGE (average in years) | 22.6 (0.04) | 0.021 | 0.723 | 0.470 | 0.489 |
| Hunger (arbitrary)b | 18.9 (0.2) | 0.004 | 0.150 | 0.881 | 0.887 |
| Thirst (arbitrary)b | 36.4 (0.2) | −0.039 | −1.377 | 0.170 | 0.161 |
| Fatigue (arbitrary)b | 29.9 (0.3) | 0.045 | 1.657 | 0.099 | 0.059 |
| Last snack (arbitrary)b | 24.5 (0.2) | −0.041 | −1.416 | 0.158 | 0.207 |
| Last meal (arbitrary)b | 49.2 (0.4) | 0.001 | 0.018 | 0.986 | 0.981 |
Beta represents the standardized coefficient, a measure of the slope of the line. Partial statistics on each regressor with Perceived Calorie Content as the dependent variable.
aThe power of high spatial frequencies was scaled to the low-frequency peak. This unit represents a ratio between high- and low-frequency and is thus adimensional.
bParticipants chose a point on a line which was divided in 100 bins for analyses; hence, the scale is 1–100.