Study 1
(n = 188) | 2 (Adding vs. Not adding a ‘donation cart’) | Donation intention:
P Adding a ‘donation cart’ = 78.26%
P Not adding a ‘donation cart’ = 63.54%
χ2 (1, N = 188) = 4.92, p = 0.027, φ = 0.16 |
Study 2A
(n = 205) | 2 (Add to the donation cart vs. Donate immediately) | Decision intention1:
M Add to the donation cart = 5.24, SD = 1.99
M Donate immediately = 4.62, SD = 2.12
F (1, 203) = 4.57, p = 0.034, η2 = 0.02
Perceived decision difficulty2:
M Add to the donation cart = 3.16, SD = 1.40
M Donate immediately = 3.71, SD = 1.82
F (1, 203) = 5.90, p = 0.016, η2 = 0.03 |
Study 2B
(n = 288) | 2 (Add to the donation cart vs. Donate immediately) | Decision intention:
P Add to the donation cart = 75.52%
P Donate immediately = 60.00%
χ2 (1, N = 288) = 7.94, p = 0.005, φ = 0.17
Perceived decision difficulty2:
M Add to the donation cart = 2.63, SD = 1.35
M Donate immediately = 2.97, SD = 1.45
F (1, 286) = 4.14, p = 0.043, η2 = 0.01 |
Study 3
(n = 277) | 2 (Adding vs. Not adding a ‘donation cart’) | Donation intention:
P Adding a ‘donation cart’ = 72.14%
P Not adding a ‘donation cart’ = 60.58%
χ2 (1, N = 277) = 4.15, p = 0.042, φ = 0.12
Consistency motive3:
M Adding a ‘donation cart’ = 5.69, SD = 1.17
M Not adding a ‘donation cart’ = 5.37, SD = 1.18
F (1, 275) = 5.24, p = 0.023, η2 = 0.02 |
Study 4A
(n = 521) | 2 (Adding vs. Not adding a ‘donation cart’; manipulate)
×
2 (High vs. Low preference for consistency4; measure) | Main effect of adding (vs. not adding) a ‘donation cart’ on donation intention:
P Adding a ‘donation cart’ = 75.48%
P Not adding a ‘donation cart’ = 58.85%
χ2 (1, N = 521) = 16.34, p < 0.001, φ = 0.18
Main effect of preference for consistency on donation intention:
B = 0.42, SE = 0.09, Wald χ2 = 24.89, p < 0.001, odds ratio = 1.53
Interaction effect:
B = 0.56, SE = 0.18, Wald χ2 = 9.59, p = 0.002, odds ratio = 1.76
A Johnson-Neyman analysis showed that when the preference for consistency score exceeded 4.45 (covering 78.69% of the sample), the effect of adding (vs. not adding) a ‘donation cart’ on donation intention was significant (B = 0.47, z = 1.96, p = 0.05). |
Study 4B
(n = 403) | 2 (Adding vs. Not adding a ‘donation cart’; manipulate)
×
2 (High vs. Low preference for consistency; manipulate) | Main effect of adding (vs. not adding) a ‘donation cart’ on donation intention:
P Adding a ‘donation cart’ = 72.36%
P Not adding a ‘donation cart’ = 69.61%
χ2 (1, N = 403) = 0.37, p = 0.54
Main effect of high (vs. low) preference for consistency on donation intention:
P High preference for consistency = 72.38%
P Low preference for consistency = 69.82%
χ2 (1, N = 403) = 0.32, p = 0.57
Interaction effect:
B = 0.96, SE = 0.45, Wald χ2 = 4.49, p = 0.034, odds ratio = 2.60
In the high preference for consistency condition:
P Adding a ‘donation cart’ = 79.31%
P Not adding a ‘donation cart’ = 65.96%
p = 0.045
In the low preference for consistency condition:
P Adding a ‘donation cart’ = 66.96%
P Not adding a ‘donation cart’ = 72.73%
p = 0.35 |
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