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Figure 1 Bimodal Distribution of Patient Preferences

Histogram showing distribution of time trade-off values at baseline. The x-axis is expressed in terms of months traded, such that 24 months indicates that the patient awards no value to survival at the current state of health, and 0 months traded indicates full value. These month-values can be changed into a utility from 0 to 1 by subtracting from 24 months and then expressing as a fraction of 24. The values have been divided symmetrically into 4 ranges for group description and analysis of major changes.