Figure. The Anchoring Effect Increases Patients’ Willingness to Consider Injection Treatment for Psoriasis.

Patients were asked how willing they would be, on a 1 to 10 scale, to take an injectable treatment for their psoriasis once per month. The intervention group was first asked how willing they would be to take the injection once per day. Median willingness to a once-monthly injection in the control and intervention group were 2.0 and 7.5, respectively; the distributions in the 2 groups differed significantly (Mann-Whitney U = 733; n₁ = n₂ = 50; 2-tailed P < .001 ). Boxes indicate 25th and 75th percentiles; the horizontal line in the box indicates group median; the error bars indicate minimum and maximum values, excluding outliers.