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Table 4 Relationship between the composite structural and process quality indicators or postoperative infections and ITC characteristics

From: Is there a volume-quality relationship within the independent treatment centre sector? A longitudinal analysis

 Model IModel IIModel IIIModel IV
Type of outcome variableComposite structural and process quality indicatorPercentage postoperative infectionsPercentage postoperative infectionsPercentage postoperative infections
Type of model usedRE-LinearRE-LinearRE-LinearRE-Linear
Type of data usedAnnual dataAnnual dataTotal over 3 yearsAnnual data
Log invasive treatments0.418*** (0.089)−0.339*** (0.033)−0.094*** (0.031) 
Highest quantile invasive treatments   Reference
Higher medium quantile invasive treatments   0.029 (0.096)
Lower medium quantile invasive treatments   0.169 (0.107)
Lowest quantile invasive treatments   0.293*** (0.114)
FTE number of professionals0.009 (0.034)0.010 (0.006)0.011* (0.006)0.009 (0.009)
No chain membershipReferenceReferenceReferenceReference
Chain membership−0.393 (0.302)0.116* (0.063)− 0.130 (0.090)− 0.100 (0.074)
For-profitReferenceReferenceReferenceReference
Non-profit0.449 (0.363)0.028 (0.073)0.174** (0.075)0.187** (0.087)
Cluster/IdentifierID ITCID ITCID ChainID ITC
Observations459292112596
Number of groups21114572236
  1. Corrected for type of specialism, case-mix (i.e. ASA II & III) and year effects (except for the pooled data)
  2. ***p < 0.01, **p < 0.05, *p < 0.1