Normative reference values and regression equations to predict the 6-minute walk distance in the Asian adult population aged 21-80 years.
Meredith T Yeung, Melissa Y Chan, Katherin S Huang and 7 others
PMID 37560171WHAT IT FOUND
Existing 6-minute walk equations overestimate distance for healthy Singaporean adults.
New equations based on age, gender and effort data provide accurate local benchmarks. Clinicians should use these specific values rather than foreign norms to judge patient performance.
Key findings
01The study established normative reference values and regression equations for the 6-minute walk distance in healthy Singaporean adults aged 21-80 years.
02Measured walking distances were shorter than those predicted by 9 out of 11 previously published reference equations from other populations.
03A simplified equation using only age and gender explains 24% of the variance, while a more complex equation including heart rate data explains 58%.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The sample was heavily skewed towards younger adults, with 67% of participants aged 21-39, which may reduce the precision of norms for older adults. The ethnic profile of the participants did not match the general Singaporean population, with an over-representation of Chinese subjects. Psychological factors like fear of falling or depression were not explicitly measured, though they can influence walking performance. The most complex equation still leaves 42% of the variation in walking distance unexplained.
The easy way to misread this
Do not assume the new equations apply to patients with chronic diseases or mobility impairments. The reference values were derived strictly from healthy community-dwelling adults, so using them to judge a patient with heart failure or stroke would be inaccurate.