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Table 2 Descriptive statistics, all years (Mean, standard deviation, minimum, maximum)

From: Stroke units, certification, and outcomes in German hospitals: a longitudinal study of patient-based 30-day mortality for 2006–2014

  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
  1. aall hospitals that have QSR SMR stroke outcome data
  2. 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