The purpose of this study was to develop a brief physical activity interview for older adults (Phone-FITT) and evaluate its test–retest reliability and validity. Summary scores were derived for household, recreational, and total PA. Reliability was evaluated in a convenience sample from a fall-prevention study (N = 43, 79.4 ± 2.9 years, 51% male), and validity, in a random sample of individuals in older adult exercise programs (N = 48, 77.4 ± 4.7 years, 25% male). Mean time to complete the Phone-FITT was 10 min for participants sampled from exercise programs. Evaluation of test–retest reliability indicated substantial to almost perfect agreement for all scores, with intraclass correlation coefficients (95% confidence intervals) ranging from .74 (.58–.85) to .88 (.8–.94). For validity, Spearman’s rho correlations of Phone-FITT scores with accelerometer counts ranged from .29 (.01–.53) to .57 (.34–.73). Correlations of Phone-FITT recreational scores with age and seconds to complete a self-paced step test ranged from –.29 (–.53 to –.01) to –.45 (–.68 to –.14). This study contributes preliminary evidence of the reliability and validity of the Phone-FITT.
Gill, Zou, and Speechley are with the Dept. of Epidemiology and Biostatistics, University of Western Ontario, London, ON, Canada N6A 5C1. Jones is with the Faculty of Health and Social Development, University of British Columbia–Okanagan, Kelowna, BC, Canada V1V 1V7.