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4 <br />from these data and from his knowledge of turnover and other changes, that at least 200 <br />professional mental health service providers work in Lexington. We used our list of 173 <br />names and office addresses to draw our sample, taking every sixth name from that list. <br />We are grateful to the many practitioners who gave us their time and shared their <br />expertise. <br /> Lexington’s population in 2002 was 31,122, with 6,655 of this number under 17 years <br />of age. The hypothetical ratio of providers to citizens was thus 155.6, an exceptionally high <br />ratio compared to communities elsewhere in the nation and in the Boston metropolitan <br />area. If we take the often-utilized proportion in mental health literature of ten percent of a <br />population in need of services, there may be about 3,000 citizens at risk of mental and <br />emotional distress in Lexington, and on this estimation, the residential hypothetical <br />ratio is 1 provider per 15 residents. There is, we believe, an indisputably high number of <br />mental health service providers working in Lexington. <br /> Our study interviewed 28 solo practitioners for a sample of 16 percent of this group. <br />In addition, we interviewed from two to five professionals in each of four agencies and <br />organizations. Within the 28, 17.9 percent were psychiatrists, 42.9 percent were <br />psychologists with PhDs, 25 percent were psychologists or counselors with PsyD or EdD <br />degrees, 7.1 percent were social workers with MSW degrees, and 7.1 percent came from <br />other professions. We did not sample pastoral counselors. 85.7 percent of our solo <br />practitioners had 15 or more years of professional experience. <br />3. AGENCIES AND ORGANIZATIONS <br /> Four agencies and organizations serve Lexington, apart from solo practitioners. They <br />include Wayside RePlace, Eliot Community Human Services, the Edinburg Center Inc., <br />and the Department of Guidance Counseling at Lexington High School. <br />Wayside RePlace. RePlace has been in Lexington since 1970 when it began as a <br /> <br />