Table 2.
Changes in market share of marketed drugs and association of regional prescribing with all payments, payments to specialists versus non-specialists, and food and education payments versus speaker and consulting payments
| Payments | Oral anticoagulants | Non-insulin diabetes drugs | |||||
|---|---|---|---|---|---|---|---|
| Market share change* (95% CI) | P value | Days filled per payment†(95% CI) | Market share change* (95% CI) | P value | Days filled per payment† (95% CI) | ||
| All payments to all physicians | 0.32 (0.26 to 0.38) | <0.001 | 94 (76 to 112) | 0.12 (0.1 to 0.14) | <0.001 | 107 (89 to 125) | |
| Payment by physician type: | |||||||
| Non-specialists | 0.32 (0.23 to 0.41) | <0.001 | 100 (68 to 123) | 0.12 (0.01 to 0.15) | <0.001 | 114 (93 to 144) | |
| Specialists | 0.71 (0.58 to 0.84) | <0.001 | 212 (174 to 250) | 0.36 (0.25 to 0.47) | <0.001 | 331 (230 to 442) | |
| P value for difference between groups | <0.001 | <0.001 | |||||
| Payment type: | |||||||
| For food and beverage, gifts, or educational materials | 0.32 (0.23 to 0.41) | <0.001 | 96 (77 to 114) | 0.12 (0.01 to 0.14) | <0.001 | 110 (91 to 128) | |
| For speaker fees, consulting fees, honoraria, travel costs, and non-research grants | 1.09 (0.21 to 1.98) | 0.02 | 326 (62 to 590) | 0.53 (0.24 to 0.81) | <0.001 | 484 (222 to 745) | |
| P value for difference between groups | 0.17 | 0.01 | |||||
*Percent change in market share for one additional payment per 1000 person years of Part D coverage in an hospital referral region.
†Number of additional prescription days filled of marketed drug associated with an increase of one payment in a region.