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This study determined the factors influencing participation of elderly people in research. It involved subjects who signed consent for a study and those who refused consent. Consenters had significantly more positive feelings about being used as a subject; giving urine; giving blood; having a physical examination; being interviewed; taking an IQ test; answering questions; being a subject to help others; finding out about problems and as a way to pass time; and telling an interviewer the truth. Reasons given for partaking in research were the personality of the interviewer, interest in the project, and benefits to subject or others.
Kaye et al. (1990) studied this question.