Table 4 Study 2. Multilevel regression model including stimulus-level and participant-level predictors. Area of Interest (AOI; Brand, health, rest, dummy coded with rest as reference category), brightness, contrast, complexity, and size were level 1 (AOI-level) predictors. Picture type (Alcohol, soda, dummy coded with soda as reference category) and presentation order were level 2 (Picture level) predictors. Advice condition (Alcohol, control, dummy coded with control as reference category) and baseline motivation to reduce drinking were level 3 (Participant level) predictors. All predictors were included as individual main effects and in all possible two-way and three-way interactions with picture type and AOI
Variable | Model 2 (stimulus-level and participant-level predictors) | |||||
|---|---|---|---|---|---|---|
Two-way interactions | Three-way interactions. | |||||
Main effect | x picture type | x AOI brand | x AOI health | x AOI brand x picture type | x AOI health x picture type | |
b (SE) | b (SE) | b (SE) | b (SE) | b (SE) | b (SE) | |
Intercept | 1.78 (1.45) | - | - | - | - | - |
AOI brand | −0.26 (2.14) | −22.46 (3.04)*** | - | - | - | - |
AOI health | −0.54 (1.72) | −8.46 (2.23)*** | - | - | - | - |
Picture type | 8.46 (1.93)*** | - | 22.46 (3.04)*** | −8.46 (2.23)*** | - | - |
Order | −0.01 (0.01) | 0.02 (0.02) | −0.02 (0.02) | 0.01 (0.02) | −0.002 (0.02) | −0.01 (0.02) |
Brightness | 0.005 (0.003)+ | −0.03 (0.01)*** | −0.01 (0.01) | −0.01 (0.01) | 0.10 (0.01)*** | 0.04 (0.01)*** |
Contrast | −0.01 (0.01) | −0.15 (0.02)*** | 0.003 (0.01) | 0.01 (0.01) | 0.16 (0.02)*** | 0.15 (0.02)*** |
Complexity | 10.98 (7.94) | 23.85 (11.08)* | −4.14 (9.06) | −10.41 (8.20) | −18.89 (12.32) | −30.03 (11.36)** |
Size | 0.03 (0.01)** | 0.01 (0.01) | 0.04 (0.02)* | −0.02 (0.06) | 0.14 (0.03)*** | 0.20 (0.07)** |
Advice condition | 0.03 (0.27) | 0.37 (0.32) | −0.69 (0.29)* | 0.11 (0.29) | −0.45 (0.40) | −0.51 (0.40) |
Baseline motivation to reduce drinking | −0.01 (0.04) | 0.04 (0.04) | −0.02 (0.04) | 0.03 (0.04) | −0.07 (0.06) | −0.06 (0.06) |
Random effects | Residual variance | Proportion residual variance explained | ||||
Level 3 | 0.55 (0.12) | −29.67% | ||||
Level 2 | 4.29 (0.26) | 12.76% | ||||
Level 1 | 16.97 (0.29) | 35.1% | ||||
χ 2(47) | 31.72** | |||||