Table 1. Schedule of measures for economic evaluation.
| Measure | Data collection instrument | Timing | Source | Level at which data are collected |
| X-ray occurred1,2; CT scan occurred 3; X-ray or CT scan occurred4 | Medicare data | 12 months | Medicare Australia | GP |
| Advice to stay active; Advised bed rest; X-ray referral; Any imaging referral | Questionnaire (patient vignettes) | 12 months | GP | GP |
| Direct costs of developing intervention | Data abstraction; | On completion of development | Admin records | Intervention |
| Interview | Project officers | |||
| Direct costs of delivering intervention | Data abstraction; | On completion of delivery to all GPs | Admin records | Intervention |
| Interview | Project officers |
1
Primary outcome.
2
Medicare data: number of referrals for all lumbar spine and pelvis x-ray services by each included GP for a 12 month period after the intervention/control was delivered.
3
Medicare data: number of referrals for all lumbar spine and pelvis CT scan services by each included GP for a 12 month period after the intervention/control was delivered.
4
Medicare data: number of referrals for all lumbar spine and pelvis x-ray or CT scan services by each included GP for a 12 month period after the intervention/control was delivered.