Table 4.
Estimated Effect of Cannabis Use on Hospital Chargesa from FHDD 1995–2000
| Coefficient from OLS | Average Difference from Propensity Score Matching | |
|---|---|---|
| Primary Diagnosis of Alcohol Problem Disorders (n=56,579) | ||
| Base Model | 0.19** (0.015) | 0.16** (0.180) |
| Base + Tobacco and Other Drugs (TOD) | 0.15** (0.016) | 0.11** (0.022) |
| Base + TOD + Hospital Fixed Effects | 0.07** (0.014) | 0.08** (0.020) |
| Primary Diagnosis of Mood Disorders (n=253,158) | ||
| Base Model | 0.032** (0.008) | 0.032** (0.008) |
| Base + Alcohol, Tobacco & Other Drugs (ATOD) | 0.019* (0.008) | 0.021* (0.008) |
| Base + ATOD + Hospital Fixed Effects | 0.023* (0.007) | 0.015 (0.011) |
| Primary Diagnosis of Thought Disorders (n=136,264) | ||
| Base Model | 0.027* (0.011) | 0.023* (0.012) |
| Base + Alcohol, Tobacco & Other Drugs (ATOD) | 0.006 (0.012) | −0.001 (0.015) |
| Base + ATOD + Hospital Fixed Effects | −0.016 (0.011) | −0.007 (0.016) |
a
Charges are in logs. Additional regressors include the patient characteristics (gender, race/ethnicity, age category, marital status), medical case characteristics (discharge status, DRG and insurance type), and year dummy variables. Standard errors are reported in parentheses. Statistical significance is indicated as follows:
*
significant at the 5% level (two-tailed test);
**
significant at the 1% level (two-tailed test).