| CI | confidence intervals |
| COPD | Chronic Obstructive Pulmonary Disease |
| GC | Gini Coefficient |
| IRR | Incidence-Rate Ratios |
| MDD | Major depressive disorder |
| NBRG | Negative Binomial Regression |
| NH | Non Hispanic |
| NHANES | National Health and Nutrition Examination Survey (NHANES) |
| PHQ | (Public Health Questionnaire, PHQ-9) |
| PIR | Property Income Ratio |
| SD | standard deviation |
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