Input parameters for sensitivity analysis
| Parameter | Base case | Lower limit | Upper limit | Comment |
| Probabilities | ||||
| Response to initial invitation (model 1-LAB) | 9.8% | 6.3% | 13.3% | Variation between clinics 1 and 2 is used for the lower and upper limits |
| Response to initial invite and schedule HC appointment (model 2-POCT) | 9.8% | 6.3% | 13.3% | Variation between clinics 1 and 2 is used for the lower and upper limits |
| Schedule phlebotomy appointment (model 1-LAB) | 89.4% | 84% | 94.7% | Variation between clinics 1 and 2 is used for the lower and upper limits |
| Attend phlebotomy | 95.0% | 90% | 100% | Assumption |
| Schedule HC appointment (model 1-LAB) | 95.0% | 95% | 100% | Assumption |
| Attend HC appointment (model 1-LAB) | 95.0% | 90% | 100% | Assumption |
| Attend HC appointment (model 2-POCT) | 89.4% | 84% | 94.7% | Variation between clinics 1 and 2 is used for the lower and upper limits |
| Staff time (minutes) | ||||
| PM for sending invite letter and phlebotomy request form (model 1-LAB) | 6 | 1 | 10 | Assumed 1 min if via Docmail and 5 min if manual |
| Admin time for scheduling phlebotomy appointment (model 1-LAB) | 5 | 1 | 6 | Assumed up to 6 min during busy times |
| HCA or nurse time for phlebotomy (model 1-LAB) | 10 | 8 | 15 | Assumed 8 min if expedient or 15 min |
| Admin time for scheduling HC appointment (model 1-LAB) | 5 | 1 | 6 | Assumed up to 6 min during busy times |
| HCA or nurse time for Health Check (model 1-LAB) | 20 | 20 | 40 | 20 min is minimum for data entry time stamp |
| Admin time for scheduling Health Check appointment (model 2-POCT) | 5 | 1 | 6 | Assumed up to 6 min during busy times |
| HCA or nurse time for health check (model 2-POCT) | 30 | 20 | 40 | 20 min is minimum for data entry time stamp |
| Salaries* | ||||
| Practice manager (£ per hour) | £26.32 | £23.09 | £29.54 | From source |
| Admin (£ per hour) | £12.26 | £11.26 | £13.25 | From source |
| HCA or nurse (£ per hour) | £20.00 | £20.00 | £44.00 | HCA or nurse salaries are used for the lower and upper limits |
| Staff time costs (based on staff time multiplied by salary) | ||||
| Sending invite letter and phlebotomy request (model 1) | £2.63 | – | – | Based on parameters above |
| Schedule phlebotomy (model 1-LAB) | £1.02 | – | – | Based on parameters above |
| Phlebotomy (model 1-LAB) | £3.33 | – | – | Based on parameters above |
| Schedule HC appointment (model 1-LAB) | £1.02 | – | – | Based on parameters above |
| HC appointment (model 1-LAB) | £6.67 | – | – | Based on parameters above |
| Schedule HC appointment (model 2-POCT) | £1.02 | – | – | Based on parameters above |
| HC appointment (model 2-POCT) | £10.00 | – | – | Based on parameters above |
| Other costs | ||||
| Letter with phlebotomy request form | £0.65 | 0.65 | 0.74 | 55p (second-class mail) or 64p (first-class mail)+10p for printing and stationary costs |
| Consumables lab | £0.62 | 0.62 | 0.62 | No range proposed as these were the costs provided by Lab |
| Glucose or HbA1c test lab | £3.19 | £3.19 | £3.80 | Glucose or HbA1c test is used for lower and upper limits provided by Lab |
| Cholesterol test lab | £3.19 | £3.19 | £3.19 | No range proposed as these were the costs provided by Lab |
| POCT consumables | £6.02 | £5.00 | £7.00 | Assumed that other devices might have different costs |
| POCT training cost, per test† | – | – | £0.08 | Excluding (lower limit) or including (upper limit) these costs |
| Cost of POCT device, per test‡ | – | - | £0.75 | Excluding (lower limit) or including (upper limit) these costs |
*From PSSRU Unit Costs of Health and Social Care 2014.
†Based on 8-hour training costs for HCA divided by 2000 tests.
‡Based on £950–£1500 cost range of POC device divided by 2000 tests.
HC, health care; HCA, healthcare assistant; POCT, point-of-care testing.