Usage of anti-thromboembolia stockings in 2 different groups

OPS Codes in 2 Groups. Group A without using graduated compression stockings and Group B with using of graduated compression stocking. The groups are similar to each other. Using the propensity score Analysis there is no significant difference. The Operationen- und Prozedurenschlüssel (OPS) (in 2008, and 2005: OPS-301) is the German modification of the ICPM and now the official classification of operational procedures for power control, the performance record and basis for the claims processing (for inpatient services for G-DRG) of the German hospitals and physicians. The OPS is now provided on an annual basis by Deutsches Institut für Medizinische Dokumentation und Information.