Changing the pattern out of hours: a survey of general practice cooperatives

Abstract
In May 1996 a postal questionnaire was devised after an initial telephone survey of 20 cooperatives and sent to all 98 organisations then registered with the national association. Sixty seven responses (68%) were received after two reminders. There was a slight bias towards smaller and newer cooperatives. Respondents represented 5476 general practitioners covering 11 462 500 patients.