Heterogeneity in preferences associated with cluster membership
| Cluster | 1 (n=160) | 2 (n=22) | 3 (n=17) | P value |
| Attribute | Mean utility (SE) | Mean utility (SE) | Mean utility (SE) | |
| Cost of Supplement (per US$1) | −0.01 (0.002) | −0.06 (0.006) | −0.04 (0.006) | <0.001 |
| Shortened healing time (per week) | 0.24 (0.01) | 0.25 (0.03) | 0.39 (0.03) | <0.001 |
| Risk reduction of reoperation (per %) | 0.41 (0.02) | 0.33 (0.05) | 0.55 (0.06) | 0.01 |
| No supplementation constant | −12.85 (0.17) | −6.95 (0.46) | −3.94 (0.53) | <0.001 |