Fixed-Effects Regression of County-Level Pediatrician Workforce per 1000 Residents, 2013-2018 (n = 600 County-Years)
| Variable | Primary Analysis | Sensitivity Analysis* | ||||
|---|---|---|---|---|---|---|
| Coefficient | 95% CI | P | Coefficient | 95% CI | P | |
| Gini coefficient ×10 | 0.20 | −0.01, 0.42 | 0.064 | 0.19 | −0.02, 0.40 | 0.081 |
| Year | −0.02 | −0.05, 0.01 | 0.209 | −0.04 | −0.07, −0.01 | 0.008 |
| Percent of adults with college degree | 0.02 | 0.00, 0.04 | 0.094 | 0.02 | −0.003, 0.04 | 0.085 |
| Median family income ($1000s) | −0.01 | −0.03, 0.00 | 0.064 | −0.01 | −0.03, 0.00 | 0.108 |
| Average family size | −0.09 | −0.16, −0.01 | 0.020 | −0.08 | −0.15, −0.002 | 0.045 |
| Percent of males (18+) who are married | −0.01 | −0.02, −0.003 | 0.020 | −0.01 | −0.02, −0.001 | 0.025 |
| Percent male | 0.00 | −0.05, 0.05 | 0.928 | −0.04 | −0.9, 0.02 | 0.178 |
| Percent Black or African American | −0.04 | −0.08, −0.001 | 0.046 | −0.06 | −0.10, −0.02 | 0.005 |
| Percent Hispanic or Latino | −0.02 | −0.10, 0.05 | 0.538 | 0.01 | −0.06, 0.09 | 0.742 |
| Median age (years) | 0.05 | 0.003, 0.10 | 0.037 | |||
| Percent population <18 years old | −0.14 | −0.21, −0.07 | <0.001 | |||
Abbreviation: CI, Confidence interval.
↵* The sensitivity analysis used percent population <18 years old as the age measure in each county and year, rather than median age, as an alternative strategy to account for the size of the pediatric population and associated demand for pediatricians.