Sensitivity analysis | Explanation of what is changed compared to the primary analysis |
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Changing the time horizon. | Time horizon changing from 10 years in the primary analysis to 1 year, 5 years, 20 years, and 100 years (lifetime of the cohort). |
Analysing results from an NHS perspective. | Estimating cost effectiveness using the change in NHS costs and intervention costs only (without any societal costs). |
Analysing results from a social care perspective. | Estimating cost effectiveness using the change in social care and intervention costs only (without any NHS costs). |
Including social care costs and productivity. | Adding an economic estimate of changes to productivity arising from the intervention. |
Including all wider societal costs. | Including an economic estimate of the intervention on all wider societal costs (including productivity and social care costs). |
Using a discount rate of 3.5%. | Changing the discount rate for costs and outcomes from 1.5 to 3.5%. |
No disease costs estimated for diseases not explicitly modelled by PRIMEtime CE (unrelated disease costs). | Removing from the model any NHS and social care costs estimated to accrue due to diseases that are not explicitly modelled by PRIMEtime CE. |
No cancer included in the model | Cancer removed from the model so that only IHD, stroke, type two diabetes, and liver cirrhosis are included. |
Only including diseases directly related to the risk factor affected. | For a diet intervention, only IHD and stroke are included in the model, and for a physical activity intervention, IHD, stroke, type two diabetes, breast cancer, and colorectal cancer are included. |