Table 2.
Descriptive statistics, all years (Mean, standard deviation, minimum, maximum)
| Mean | SD | Min | Max | |
|---|---|---|---|---|
| Number of observationsa (2006–2014) | 7462 | |||
| Average stroke 30-day SMRb | 1.06 | 0.4 | 0.0 | 17.8 |
| Log average stroke 30-day SMRb | 0.02 | 0.3 | −2.1 | 2.9 |
| Hospitals with a specialized SU | 0.31 | 0.5 | 0.0 | 1.0 |
| Average complex stroke procedures | 144.96 | 303.0 | 0.0 | 6443.0 |
| Log average complex stroke proceduresb | −11.83 | 12.3 | −20.7 | 8.8 |
| Hospitals with DSG-certified SU | 0.16 | 0.4 | 0.0 | 1.0 |
| Hospitals with KTQ-TQH certification | 0.29 | 0.5 | 0.0 | 1.0 |
| Average case volume stroke cases | 202.17 | 279.0 | 0.0 | 5327.0 |
| Log average case volume stroke casesb | 3.84 | 4.1 | −20.7 | 8.6 |
| Share stroke cases / inpatient cases | 0.03 | 0.1 | 0.0 | 0.8 |
| Hospitals with teaching status | 0.47 | 0.5 | 0.0 | 1.0 |
| Average number of hospital beds | 342.23 | 302.0 | 0.0 | 3213.0 |
| CMS specialization index | 1.35 | 0.8 | 0.0 | 4.3 |
| Private, for-profit hospitals | 0.20 | 0.4 | 0.0 | 1.0 |
| Private, non-for-profit hospitals | 0.43 | 0.5 | 0.0 | 1.0 |
| Public hospitals | 0.37 | 0.5 | 0.0 | 1.0 |
aall hospitals that have QSR SMR stroke outcome data
bQSR stroke patient volume applied as analytical weights; 0.000000001 or 1 added before taking the log to avoid losing observations with 0 values, results are similar for both