[Determinants for diagnostic and therapeutic co-operation between general practitioners].

: In the light of new opportunities for structural arrangements in Germany calling for higher co-operation between physicians in private practice, determinants for diagnostic and therapeutic co-operation need to be examined. In the present study, 130 general practitioners were asked in regard to four typical primary care indication groups whether they prefer to diagnose and treat the patients on their own or in co-operation with colleagues. This self-assessment was validated using the data from 2,069 physician-patient contacts: physicians preferring therapy in co-operation actually referred patients three times more often. Concerning both gastro-intestinal and rheumatic disorders, physicians' preferences for diagnostic and therapeutic co-operation are highly correlated (phi = 0.491 and 0.528 respectively); preferences for diagnostic and therapeutic co-operation across indications are not as strongly correlated (phi = 0.334 and 0.397 respectively). However, there is no general indication-independent attitude towards co-operation for individual physicians: Indication and type of services are two factors which--probably in addition to others--affect co-operation independently. We confirm earlier conclusions that the detailed analysis of provider and patient characteristics together with the actual patient management on a case by case basis is a powerful tool for health services research.