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Interview Modality

Effects on Costs and Data Quality in a Sample of Older Women

Jason M. Hayden, BS

Center on Aging, Bradley University

Objectives:To contrast the costs and quality of data collected in person, by telephone, and by self-administered questionnaires in a sample of older persons. Methods: Data collected via interviews with 586 women are contrasted on four dimensions. Results:The cost of data collection was 25% to 30% lower for the self-administered mode than for other modes. Response rates were highest for the inperson interviewand lowest for the self-administered questionnaire. The rate of missing data was highest for the self-administered questionnaire. Significant differences in response effects were found across mode, with respondants to self-administered questionnaires profiling the poorest. Discussion:The costs and quality of data collected by various modes are discussed in terms of their implications for understanding the physical and mental well-being of older people.

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