Table 4. Poisson Fixed Effects Models: Number of Wells per Zip Code per Year.
| Wells RR (p-value) | Year RR (p-value) | |
|---|---|---|
| Inpatient total | 1.0003 (0.076) | 0.984 (0.128) |
| Cardiology | 1.0007 (0.0007) | 0.966 (0.029) |
| Dermatology | 1.0010 (0.039) | 0.977 (0.345) |
| Endocrine | 1.0008 (0.086) | 0.963 (0.316) |
| Gastroenterology | 1.0003 (0.338) | 0.992 (0.749) |
| General medicine | 1.0002 (0.574) | 1.037 (0.022) |
| Generals surgery | 1.0000 (0.849) | 1.104 (0.213) |
| Gynecology | 1.0002 (0.708) | 0.860 (<0.0001) |
| Hematology | 0.9997 (0.657) | 1.023 (0.616) |
| Neonatology | 1.0014 (0.018) | 0.959 (0.125) |
| Nephrology | 0.9998 (0.461) | 1.025 (0.250) |
| Neurology | 1.0006 (0.037) | 1.001 (0.948) |
| Normal newborns | 1.0000 (0.969) | 0.963 (0.030) |
| Ob/delivery | 1.0002 (0.411) | 0.968 (0.411) |
| Oncology | 1.0015 (0.004) | 0.956 (0.081) |
| Ophthalmology | 1.0010 (0.593) | 1.084 (0.255) |
| Orthopedics | 0.9993 (0.011) | 0.970 (<0.0001) |
| Other/ob | 1.0003 (0.727) | 0.899 (0.007) |
| Otolaryngology | 1.0000 (0.982) | 0.978 (0.614) |
| Psych/drug abuse | 1.0004 (0.073) | 1.035 (0.006) |
| Pulmonary | 1.0000 (0.850) | 0.989 (0.482) |
| Rheumatology | 1.0014 (0.043) | 0.961 (0.227) |
| thoracic surgery | 1.0011 (0.100) | 0.989 (0.708) |
| Trauma | 1.0008 (0.174) | 1.021 (0.505) |
| Urology | 1.0010 (0.012) | 0.983 (0.464) |
| Vascular surgery | 0.9997 (0.539) | 0.948 (0.024) |
Note: RR = Risk ratio