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48 TUESDAY 19 JULYThe parcipaon of physicians working in private offices in research studies is tradionally very low in France.In order to improve the parcipaon rate, we conducted a methodological randomised trial to assess thecost/effecveness of different enrolment protocols for use in a future survey exploring healthcare provider’satudes, knowledge and pracces regarding sexual and reproducve health.1.23.2 Implementaon of a Pracce Guideline for the Pain Management of Residents in Nursing Homes –tesng the effecveness by a cluster randomized trialS. Ellert 1 , A. Budnick 1 , M. Kölzsch 2 , I. Wulff 1 , S. Kalinowski 1 , R. Kreutz 2 , D. Dräger 11 Instut für Medizinische Soziologie der Charité, Germany; 2 Instut für Klinische Pharmakologie und Toxikologieder Charité, GermanyIntroducon: The intenon of the PAiN II study is to develop and implement a ”Pracce Guideline for theAppropriate Pain Management” for nursing home staff and general praconers. The second aim is to evaluatethe effecveness of this guideline. Methods: The design of this study will be a cluster randomized trial andit is conducted in eight nursing homes (NH) in Berlin and Brandenburg. In the intervenon group (four NH)the guideline will be implemented by trainings delivered to nursing home staff and praconers three mesduring the trial.1.23.3 Why telephone surveys are the best choice to conduct a quantave representave firm surveyI. Krause 11 University of Bielefeld , GermanyFirm representaves are not as easy to reach by telephone, by mail, or by leer as private persons. Usuallythe communicaon path is a selecve one. The interviewers have to pass gatekeepers to reach the personof choice, and it is impossible to contact these populaon personally without an appointment. Furthermorea smaller populaon and high research interest lead to increasing problems of accessibility. So firm representavesshould be considered as a special populaon. But what is the best method to carry out a surveyin these special populaon to get a representave sample? The proposed presentaon wants to discuss in acomparave manner the different survey methods that can be used in a firm survey...1.24 Nonresponse IITo be held on July 19, 2011 from: 14:00 to 15:30, in room 410.Coordinated by: Dominique Joye - University of Lausanne, Switzerland1.24.1 Anonymous and non-anonymous mail surveys in the general populaon. Their impact on responserates and response effects.K. Reuband 11 University of Duesseldorf, GermanyAccording to common pracce in mail surveys quesonnaires have a number on their first page in order tomake reminders of non-respondents more economical. However the number might be seen as a sign for lackof anonymity by respondents and affects their responses. No studies have been yet done and shown whatthe effects of these differences in methodology are.Bases on a split-design (with and without number on thequesonaire in four surveys of the general populaon in three German cies (in West and East Germany)it is analyzed whether effect on response rates and responses exists, in which subgroups and under whatcondions. The surveys were done by Dillman design with up to three reminders and contained non-sensiveand sensive quesons. The samples were drawn from the city register of residents 18 years and older.