Table 4.
Results from the Random Effects Probit Model (Based on Effects Coding #)
| Variable | Coefficient | Std. Err. |
|---|---|---|
| Testing location | ||
| Public | 0.110*** | 0.023 |
| Doctor's office | −0.082** | 0.024 |
| Home | −0.029 | 0.021 |
| Sample collection method | ||
| Draw blood | −0.139*** | 0.030 |
| Swab/oral fluids | 0.116*** | 0.030 |
| Urine | 0.088** | 0.030 |
| Finger prick | −0.065* | 0.031 |
| Timeliness/accuracy | ||
| 1–2 weeks>accuracy | −0.074*** | 0.022 |
| Immediate>accurate | 0.244*** | 0.024 |
| Immediate<accurate | −0.170*** | 0.023 |
| Privacy/anonymity of test results | ||
| Only you know | 0.225*** | 0.036 |
| Results in person—not linked to name | 0.217*** | 0.034 |
| Results by phone—not linked to name | 0.076* | 0.037 |
| Results in person—linked to name | −0.193*** | 0.037 |
| Results by phone—linked to name | −0.326*** | 0.036 |
| Availability of counseling | ||
| In-person counseling | 0.024 | 0.030 |
| Brochure | −0.024 | 0.030 |
| Test price | −0.009*** | 0.000 |
| Constant | 0.019 | 0.025 |
| Predicted utility | .138 | |
| Number of observations | 3,366 | |
| Number of respondents | 339 | |
| Log-likelihood | −1,975.4 | |
| Chi-square | 739.18 (p<.001) | |
| p <.001***, p <.01**, p <.05* | ||
Notes: # Effects coding computes an effect size for each attribute level. See the accompanying paper (Phillips, Maddala, and Johnson 2002) for details.