NEW ENGLAND RESEARCH INSTITUTES, INC.
The Boston Area Community Health (BACH) Survey is currently supported by U01DK056842 from NIDDK. BACH is a population-based, epidemiologic cohort survey conducted among 5,501 men and women aged 30 to 79 residing in Boston, Massachusetts. A multistage, stratified cluster sampling design was used to recruit approximately equal numbers of persons in pre-specified groups defined according to age (30 to 39, 40 to 49, 50 to 59, 60 to 79), race and ethnic groups (black, Hispanic, white) and gender. The baseline data were collected between April 2002 and June 2005 during a two-hour interview conducted by a trained, bilingual interviewer, after written informed consent was obtained. Interviews were completed with 63.3% of eligible persons, with a resulting study population of 2,301 men and 3,200 women comprising 1,765 black participants, 1,877 Hispanic participants and 1,859 white participants. Information collected included detailed information on symptoms suggestive of nine different urologic conditions, major medical conditions, medication use, anthropometrics, income, education, life style behaviors, and psychosocial factors. In 2007 BACH transitioned to a longitudinal cohort study, and is currently in its first follow-up. At this time, approximately 50% of the follow-up field visits have been completed. BACH is widely considered to be a landmark epidemiologic study in the fields of urology and urogynecology. To protect and enhance the scientific integrity of this milestone project, it is essential that the response rate be maximized to ensure robust analyses and generalizability of findings. It is also vital that sufficient numbers are available, especially in certain race/ethnic subgroups (e.g. younger black and all Hispanic subjects) to permit future follow-up of the BACH cohort (to minimize the threat of attrition bias). The focus of this supplement is to: 1) Increase tracing and field tracking efforts (in-house internet and telephone searches and in-field tracking to verify current addresses of subjects, apparently lost to follow-up); and 2) To increase field interviewing effort to complete the additional interviews generated by the additional tracing/tracking efforts.