Table 3.
Compiled Correlations
| Variable 1 | Variable 2 | R | R² | p-value |
|---|---|---|---|---|
| Relative Search Volume | Single-State Ocular Oncology Ophthalmologist Density Per 100,000 Residents | 0.029 | 0.001 | 0.840 |
| Relative Search Volume | Combined-State Ocular Oncologist Density Per 100,000 Residents | −0.113 | 0.013 | 0.435 |
| Relative Search Volume | % of Population Below 50% Of National Poverty Level | −0.165 | 0.027 | 0.253 |
| Urban Population % | −0.065 | 0.004 | 0.656 | |
| % of Population Living Inside Urbanized Areas | 0.021 | < 0.001 | 0.882 | |
| % of Population Living Inside Urban Clusters | −0.149 | 0.022 | 0.302 | |
| Rural Population % | 0.231 | 0.053 | 0.107 | |
| Eye Cancer Prevalence Percent (Medicare) | 0.512 | 0.262 | < 0.001* | |
| Eye Cancer Prevalence Percent (IRIS® Registry) | 0.402 | 0.161 | 0.004* | |
| Vision Screening Rate | 0.162 | 0.026 | 0.262 | |
| Single-state Ocular Oncology Ophthalmologist Density per 100,000 | % of Population Below 50% Of National Poverty Level | −0.235 | 0.055 | 0.101 |
| Urban Population % | 0.363 | 0.132 | 0.01* | |
| % of Population Living Inside Urbanized Areas | 0.422 | 0.178 | 0.002* | |
| % of Population Living Inside Urban Clusters | −0.388 | 0.151 | 0.005* | |
| Rural Population % | −0.388 | 0.277 | < 0.001* | |
| Eye Cancer Prevalence Percent (Medicare) | −0.135 | 0.018 | 0.348 | |
| Eye Cancer Prevalence Percent (IRIS® Registry) | −0.259 | 0.067 | 0.069 | |
| Vision Screening Rate | 0.383 | 0.147 | 0.006* | |
| Combined-State Ocular Oncologist Density Per 100,000 Residents | % of Population Below 50% Of National Poverty Level | −0.002 | 0.000 | 0.991 |
| Urban Population % | −0.193 | 0.037 | 0.179 | |
| % of Population Living Inside Urbanized Areas | −0.352 | 0.124 | 0.01* | |
| % of Population Living Inside Urban Clusters | 0.492 | 0.242 | <0.001* | |
| Rural Population % | 0.285 | 0.081 | 0.04* | |
| Eye Cancer Prevalence Percent (Medicare) | 0.058 | 0.003 | 0.690 | |
| Eye Cancer Prevalence Percent (IRIS® Registry) | 0.026 | 0.001 | 0.859 | |
| Vision Screening Rate | −0.231 | 0.053 | 0.107 | |
| Single-State gRDI | % of Population Below 50% Of National Poverty Level | 0.145 | 0.021 | 0.314 |
| Urban Population % | −0.478 | 0.228 | < 0.001* | |
| % of Population Living Inside Urbanized Areas | −0.513 | 0.264 | < 0.001* | |
| % of Population Living Inside Urban Clusters | 0.415 | 0.172 | 0.003* | |
| Rural Population % | 0.553 | 0.306 | < 0.001* | |
| Eye Cancer Prevalence Percent (Medicare) | 0.101 | 0.010 | 0.487 | |
| Eye Cancer Prevalence Percent (IRIS® Registry) | 0.120 | 0.014 | 0.407 | |
| Vision Screening Rate | −0.416 | 0.173 | 0.003* | |
| Combined-State gRDI | % of Population Below 50% Of National Poverty Level | −0.027 | 0.001 | 0.855 |
| Urban Population % | −0.011 | < 0.001 | 0.940 | |
| % of Population Living Inside Urbanized Areas | 0.091 | 0.008 | 0.529 | |
| % of Population Living Inside Urban Clusters | −0.222 | 0.049 | 0.121 | |
| Rural Population % | 0.017 | < 0.001 | 0.908 | |
| Eye Cancer Prevalence Percent (Medicare) | 0.094 | 0.009 | 0.517 | |
| Eye Cancer Prevalence Percent (IRIS® Registry) | 0.180 | 0.032 | 0.211 | |
| Vision Screening Rate | 0.178 | 0.032 | 0.215 | |
| mRDI | % of Population Below 50% Of National Poverty Level | −0.072 | 0.005 | 0.619 |
| Urban Population % | −0.051 | 0.003 | 0.728 | |
| % of Population Living Inside Urbanized Areas | 0.020 | < 0.001 | 0.888 | |
| % of Population Living Inside Urban Clusters | −0.124 | 0.015 | 0.391 | |
| Rural Population % | 0.066 | 0.004 | 0.650 | |
| Eye Cancer Prevalence Percent (Medicare) | 0.131 | 0.017 | 0.363 | |
| Eye Cancer Prevalence Percent (IRIS® Registry) | 0.200 | 0.040 | 0.164 | |
| Vision Screening Rate | 0.067 | 0.005 | 0.643 | |
| iRDI | % of Population Below 50% Of National Poverty Level | −0.037 | 0.001 | 0.797 |
| Urban Population % | −0.053 | 0.003 | 0.712 | |
| % of Population Living Inside Urbanized Areas | 0.016 | < 0.001 | 0.912 | |
| % of Population Living Inside Urban Clusters | −0.119 | 0.014 | 0.411 | |
| Rural Population % | 0.067 | 0.005 | 0.642 | |
| Eye Cancer Prevalence Percent (Medicare) | 0.066 | 0.004 | 0.651 | |
| Eye Cancer Prevalence Percent (IRIS® Registry) | 0.216 | 0.047 | 0.132 | |
| Vision Screening Rate | 0.045 | 0.002 | 0.755 |
Notes: *p-value ≤ 0.05.
Abbreviations: IRIS, Intelligent Research in Sight; gRDI, Relative demand index calculated from Google relative search volumes; mRDI, Relative demand index calculated from Medicare claims eye cancer prevalence; iRDI, Relative demand index calculated from IRIS® Registry eye cancer prevalence.