Table 1.
Attributes and levels included in the discrete choice experiment
| Attribute | Levels | Level code | Regression variable name |
|---|---|---|---|
| Device display (pictorial attribute)* | Two traffic light and test confidence | 0 | Traffic2 |
| Three traffic light and probability of having PAD | 1a | NA | |
| Scale and score and test confidence | 2 | Scale | |
| Data integration | Manual (e.g. input results into a patient’s record by hand) | 0 | Man |
| Automated (e.g. direct upload from the device via USB or wireless connection) | 1a | NA | |
| Training | Paper manual and formal face-to-face training course | 0 | FF |
| Paper manual and formal face-to-face training course, and electronic user guide integrated into the device | 1 | FF_ElecU | |
| Paper manual and training video or interactive online training (e.g. webinar/webex) | 2 | Vid_ElecU | |
| Paper manual and training video or interactive online training (e.g. webinar/webex) and electronic user guide | 3a | NA | |
| Cost of device | £500 | NA | Cost |
| £750 | |||
| £1000 | |||
| £1250 | |||
| £1500 | |||
| £1750 | |||
| £2000 | |||
| £2500 | |||
| Power supply | Disposable batteries with an indicator to show low battery life of the device | 0 | Disp_Batt |
| Rechargeable batteries with USB charger with an indicator to show low battery life of the device | 1 | Rech_Batt | |
| Inductive (wireless) charging of the pods attached to the finger and toe probes with an indicator to show low battery life of the device | 2a | NA | |
| Wired charging of the pods attached to the finger and toe probes with an indicator to show low battery life of the device | 3 | Wired | |
| Portability of device | The device can be moved from room to room (on a trolley and/or carried) | 0 | Room |
| The device is small enough to put in a portable bag and taken to a patient’s home for use by the health care professional | 1a | NA |
NA not applicable, PAD peripheral arterial disease
aBase level for each attribute
