Table 3.
Results of the conditional logit regression model
| Attribute and levels | Total sample (N = 116) | Doctors only (N = 94) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Coefficient | SE | p value | Lower CI (2.5%) | Higher CI (97.5%) | Coefficient | SE | p value | Lower CI (2.5%) | Higher CI (97.5%) | |
| Device displaya | ||||||||||
| Two traffic light and test confidence | 0.1780* | 0.1050 | 0.090 | − 0.0278 | 0.3839 | 0.1802 | 0.1199 | 0.133 | − 0.0547 | 0.4152 |
| Scale and score and test confidence | − 0.0448 | 0.1076 | 0.677 | − 0.2556 | 0.1660 | − 0.0644 | 0.1218 | 0.597 | − 0.3032 | 0.1744 |
| Data integrationa | ||||||||||
| Manual (e.g. input the results into a patient’s record by hand) | 0.4277*** | 0.0774 | 0.000 | 0.2760 | 0.5795 | 0.3960*** | 0.0888 | 0.000 | 0.2220 | 0.5701 |
| Traininga | ||||||||||
| Paper manual and formal face-to-face training course | 0.0737 | 0.1260 | 0.558 | − 0.1726 | 0.3200 | − 0.1157 | 0.1440 | 0.422 | − 0.3980 | 0.1666 |
| Paper manual and formal face-to-face training course and electronic user guide integrated into the device | 0.0854 | 0.1305 | 0.515 | − 0.1718 | 0.3427 | 0.0250 | 0.1511 | 0.868 | − 0.2711 | 0.3212 |
| Paper manual and training video or interactive online training (e.g. webinar/webex) and electronic user guide | 0.3340** | 0.1240 | 0.007 | 0.0913 | 0.5772 | 0.2996** | 0.1418 | 0.035 | 0.02170 | 0.5775 |
| Power supplya | ||||||||||
| Disposable batteries with an indicator to show low battery life of the device | 0.5852*** | 0.1287 | 0.000 | 0.3329 | 0.8375 | 0.5720*** | 0.1470 | 0.000 | 0.2838 | 0.8601 |
| Rechargeable batteries with USB charger with an indicator to show low battery life of the device | − 0.1724 | 0.1221 | 0.158 | − 0.4117 | 0.0669 | − 0.14267 | 0.1389 | 0.304 | − 0.4148 | 0.1295 |
| Wired charging of the pods attached to the finger and toe probes with an indicator to show low battery life of the device | − 0.2165* | 0.1186 | 0.068 | − 0.4489 | 0.0159 | − 0.1788 | 0.1357 | 0.188 | − 0.4448 | 0.0872 |
| Portability of devicea | ||||||||||
| The device can be moved from room to room (on a trolley and/or carried) | 0.1132 | 0.0727 | 0.120 | − 0.0294 | 0.2557 | 0.1175 | 0.0836 | 0.160 | − 0.0465 | 0.2815 |
| Cost of device | ||||||||||
| Amount [GB£] | 0.0001** | 0.0001 | 0.023 | <0.0000 | 0.0003 | 0.0001* | 0.0001 | 0.088 | − 0.00002 | 0.0003 |
| Alternative-specific constants | ||||||||||
| Option A | 1.1017*** | 0.07407 | 0.000 | 0.9566 | 1.2469 | 1.2470*** | 0.0851 | 0.000 | 1.0802 | 1.4137 |
| Log likelihood | − 632.0156 | NA | NA | NA | NA | − 489.5902 | NA | NA | NA | NA |
| Pseudo R2 | 0.2140 | NA | NA | NA | NA | 0.2486 | NA | NA | NA | NA |
| No. of observations | 2320 | NA | NA | NA | NA | 1880 | NA | NA | NA | NA |
NA not applicable, CI 95% confidence interval, SE standard error, GB£ Great Britain pounds, PAD peripheral arterial disease
*p < 0.10, **p < 0.05, ***p < 0.01
aAttribute reference category: device display = three traffic light and probability of having PAD; data integration = automated (e.g. direct upload from the device via USB or wireless connection); training = paper manual and training video or interactive online training (e.g. webinar/webex); power supply = inductive (wireless) charging of the pods attached to the finger and toe probes, with an indicator to show the low battery life of the device; portability of device = the device is small enough to put in a portable bag and taken to a patient’s home for use by a health care professional