Surgical procedures are classified according to the Swedish version of Classification of Operations 1985 (revised 1988) and Classification of Surgical Procedures 1997.
Later he gave a rough classification of operations into the instrumental, mental/verbal, and paper-and-pencil varieties (Bridgman 1959a, 3).
Surgical procedures are coded according to the Swedish version of Classification of Operations 1988 and Classification of Surgical Procedures 1997.
Procedure codes were derived from the patient-administration systems of the hospitals in 1998 (Classification of Operations; version 3, 1995).
Up to six surgical codes were also assigned, according to the Swedish Classification of Operations and Major Procedures.
The cohort was subsequently linked to the Swedish Inpatient Register to obtain detailed information on pelvic floor surgery based on the Swedish Classification of Operations and Major Procedures.
Furthermore, each record contains up to 10 surgical codes, assigned according to the Swedish Classification of Operations and Major Procedures (Nyren et al, 1995).
Surgery in these patients was categorized by procedure codes indicating spine operations (NA* **), and operations on the nervous system (A** **; Nordic Classification of Operations and Major Procedures, 1997) [ 27].
The hospital routine data comprise, among other items, diagnoses coded by the International Statistical Classification of Diseases and Related Health Problems, 10th Revision, German Modification (ICD-10-GM) and procedures coded according to a national classification of operations and procedures (OPS).
