Table 3. Univariable and Multivariable Random Intercepts Poisson Regression of All FEPs.
| Variable | Univariable IRR (95% CI) | Univariable Wald P Value | Multivariable IRR (95% CI)a | Multivariable LRT P Value |
|---|---|---|---|---|
| Individual level | ||||
| Minority status (vs majority) | 1.69 (1.56-1.84) | <.001 | 1.59 (1.46-1.72) | <.001 |
| Setting level | ||||
| Distance from equator (degrees) | 1.03 (1.00-1.07) | .07 | 0.99 (0.97-1.01) | .46 |
| Population density (per 1000 people per km2) | 1.02 (0.99-1.05) | .15 | 1.01 (0.99-1.02) | .44 |
| Owner-occupancy (10%) | 0.73 (0.65-0.81) | <.001 | 0.76 (0.70-0.83) | <.001 |
| Single-person households (10%) | 1.68 (1.24-2.27) | .001 | 1.06 (0.78-1.43) | .73 |
| Unemployment (10%) | 0.54 (0.34-0.84) | .007 | 0.90 (0.66-1.23) | .51 |
Abbreviations: FEP, first episode of psychosis; IRR, Incidence rate ratio; LRT, likelihood ratio test.
a
Models adjusted for age, sex, their interaction, and, for setting-level variables, race/ethnicity. IRR for nonsignificant setting-level variables obtained from a model after additional adjustment for owner-occupancy.