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Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. Acknowledgments I wish to express my whole-hearted appreciation to the members of my dissertation committee. Dr. Janet Younger, my dissertation chairperson, who guided me from the comprehensive examination to completion of my dissertation. Her in-depth knowledge in statistics and the subject matter, and her personal commitment to me, made my Ph.D. study very meaningful. Dr. Martha Moon's expertise in sample size selection, editorial comments, and speedy turn-around time were remarkable. Her caring attitude was infectious. Dr. Mary Corley, though retired, was willing to serve on my dissertation committee. Her contribution of time, organizational insight, and commitment contributed toward successful completion of my dissertation. Dr. John Clore shared his expertise in diabetes and contributed by suggesting a cross-sectiona