| Catchment Area Volume | Hospital Volume | |||||
|---|---|---|---|---|---|---|
| (1) Mean |
(2) β |
(3) p-value |
(4) Mean |
(5) β |
(6) p-value |
|
| Bed Days | 2.134 | 0199*** (0.053) |
0.368 | 2.152 | 0.103** (0.044) |
0.540 |
| Bassinet Days | 2.310 | 0.068 (0.117) |
0.786 | 2.353 | 0.029 (0.098) |
0.820 |
| RWP | 0.503 | 0.012*** (0.003) |
0.883 | 0.503 | 0.009*** (0.003) |
0.615 |
| Procedures | 2.091 | 0.063 (0.096) |
0.822 | 2.129 | 0.129 (0.103) |
0.775 |
| Diagnostics | 0.095 | 0.074*** (0.021) |
0.339 | 0.097 | 0.052*** (0.018) |
0.621 |
| C-Section | 0.280 | 0.030*** (0.005) |
0.712 | 0.280 | 0.027*** (0.005) |
0.647 |
| Severe Complication | 0.033 | −0.018*** (0.005) |
0.298 | 0.036 | −0.021*** (0.004) |
0.081 |
| Preventable Complication | 0.183 | −0.088*** (0.018) |
0.507 | 0.191 | −0.087*** (0.021) |
0.532 |
| Severe Acute Maternal Morbidity | 0.011 | −0.003 (0.002) |
0.050 | 0.012 | −0.001 (0.002) |
0.157 |
| 28-Day Infant Mortality (per 1,000) | 0.828 | 0.126 (0.771) |
0.993 | 0.791 | −0.531 (0.592) |
0.909 |
| 1-Year Infant Mortality (per 1,000) | 1.610 | −0.292 (1.090) |
0.498 | 1.593 | −0.734 (0.800) |
0.579 |
| Unplanned Readmissions (per 1,000) | 11.669 | −3.511* (2.064) |
0.682 | 12.029 | −6.879*** (2.086) |
0.946 |
| Unplanned Child Readmit (per 1,000) | 35.444 | −4.095 (4.675) |
0.986 | 36.111 | −7.327 (5.151) |
0.536 |
| 30-Day Child Hosp. (per 1,000) | 54.999 | −17.458*** (5.558) |
0.508 | 54.052 | −15.618*** (5.965) |
0.936 |
| 1-Year Unplanned Child Hosp. (per 1,000) | 84.219 | −3.460 (6.297) |
0.122 | 84.296 | −10.745 (6.506) |
0.112 |
| Any 1-Year Child Hosp. (per 1,000) | 103.296 | −16.180** (6.340) |
0.297 | 102.188 | −20.088*** (7.225) |
0.182 |
| N | 56,647 | 90,821 | ||||
Notes: All estimates considered in this table use the first difference between the current and prior birth admission. Means are shown for the current birth. All regressions include controls for calendar year, age group, sponsor’s pay grade and occupation, and sponsor’s race. Columns 1–3 control for the total volume of surgical inpatient cases in 2004 in counties that fall within 40 miles of the nearest base. Columns 4–6 control for the number of surgical inpatient cases performed at the delivery hospital in 2004, the most recent year of data availability for off-base hospitals. Hospitals are identified using zip codes. In zip codes with more than one surgical hospital we take the average. Not all zip codes are present in the 2004 AHA data, resulting in a somewhat smaller sample. Standard errors are clustered at the base level.