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© 1998 Oxford University Press

Articles

The Nottingham Longitudinal Study of Activity and Ageing: A Methodological Overview

Kevin Morgan

Centre for Ageing and Rehabilitation Studies School of Health and Related Research University of Sheffield, Northern General Hospital Sheffield S5 7AU, UK Fax: (+44) 114 271 5771; E-mail: kmorgan{at}sheffield.ac.uk

Objectives: First, to describe the background and methodological approach to the assessment of customary physical activity health and psycho-social status used by the Nottingham Longitudinal Study of Activity and Ageing; second, to provide information on the sampling strategy and survey response rates for three waves of data collection; and, third, to provide information on the reliability and validity of the survey assessments.

Design: Longitudinal study.

Subjects: 1042 people originally aged 65 and over, randomly sampled from general practitioner lists in Nottingham, UK.

Methods: A descriptive overview of response rates (%), instrument reliability ({alpha} coefficients) and intercorrelations among measured outcomes (correlation coefficients and principal components analysis).

Main outcome measures: Questionnaire-assessed levels of physical activity; instrumental measurements of handgrip strength, weight, demi-span and shoulder flexibility; brief assessments of depression, social engagement, life-satisfaction and cognitive impairment.

Results: The study achieved a baseline (TI) response rate of 80%, with re-interview rates of 88% and 73% for T2 (1989) and T3 (1993) surveys respectively. For both men and women, factor scores derived from first principal components extracted from Ti survey data showed significant (r≥0.4; P< 0.001) product moment correlations with instrumental measurements of handgrip strength and shoulder flexibility All the brief assessment measures showed satisfactory levels of reliability ({alpha}≥0.7)

Keywords: activity, ageing, exercise, health, longitudinal study, wellbeing


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