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J Am Geriatr Soc. 2014 Feb;62(2):329-35. doi: 10.1111/jgs.12633. Epub 2014 Jan 17.

Assessing mobility difficulties for cross-national comparisons: results from the World Health Organization Study on Global AGEing and Adult Health.

Author information

  • 1Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, Minnesota; Minnesota Population Center, University of Minnesota, Minneapolis, Minnesota.

Abstract

OBJECTIVES:

To assess the correspondence between self-reported and measured indicators of mobility disability in older adults in six low- and middle-income countries (LMICs).

DESIGN:

Cross-sectional analysis of Study on Global AGEing and Adult Health (SAGE).

SETTING:

Household surveys in China, India, Russia, South Africa, Ghana, and Mexico.

PARTICIPANTS:

Community-dwelling SAGE respondents aged 65 and older (N = 12,215).

MEASUREMENTS:

Objective mobility was assessed according to a 4-m timed walk at normal pace conducted in the respondent's home; slow walking speed was defined according to the Fried frailty criteria (lowest quintile of walking speed, adjusted for age and height). Self-reported mobility difficulty was assessed according to a question about ability to walk 1 km; this response was dichotomized into any versus no self-reported difficulty walking 1 km (reference no difficulty). The age- (5-year groups) and sex-specific probability of self-reporting difficulty walking 1 km was estimated in those with a measured slow walk using logistic regression.

RESULTS:

Between 42% and 76% of people aged 65 and older reported any difficulty walking 1 km. Average walking speed was slowest in Russia (0.61 m/s) and fastest in China (0.88 m/s). The probabilities of reporting any difficulty walking 1 km in women aged 65 to 69, for example, with a slow walk varied (China = 0.35, India = 0.90, Russia = 0.68, South Africa = 0.81, Ghana = 0.91, Mexico = 0.73; test of country differences P < .001). There was significant variation at older ages, albeit smaller in magnitude. Patterns were similar for men.

CONCLUSION:

Although correspondence between an objective and self-reported measure of mobility was generally high, correspondence differed significantly between LMICs. International comparisons of self-reported disability measures for clinical, prevention, and policy guidelines in LMICs should consider that self-reported data may not correspond to objective measures uniformly between countries.

© 2014, Copyright the Authors Journal compilation © 2014, The American Geriatrics Society.

KEYWORDS:

developing countries; disability; gait; measurement; mobility

PMID:
24438515
[PubMed - indexed for MEDLINE]
PMCID:
PMC3945402
[Available on 2015/2/1]
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