Weight control behaviors among Koreans.
Kim Sang Dol
PMID 28603370WHAT IT FOUND
Exercise was the most common self-reported weight-control behavior among Koreans in the survey, including walking, strength, and flexibility.
The study does not show exercise worked, and many weight-control records were missing.
Key findings
01Exercise was the most prevalent weight-control behavior among Koreans, and the listed exercise types were walking, muscle strengthening, and flexibility exercises.
02The paper states that weight control was performed by more than half of participants each year, but its table reports system missing weight-control values of 51.8%, 51.8%, 51.5%, 53.2%, and 51.5%.
03The analysis used Korea National Health and Nutrition Examination Survey data from 2010 through 2014 and included 40,485 participants.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
This is a self-reported survey of weight-control behaviors, not a trial, so it cannot show that exercise causes weight control or improves health. The table reports system missing weight-control values of 51.8%, 51.8%, 51.5%, 53.2%, and 51.5%, which means the weight-control answers are not complete. The paper says weight control was performed by more than half of participants each year, but that statement is hard to reconcile with the missing values in the same table. The survey did not follow people to see whether their weight-control methods produced any effect. The authors' suggestions about exercise programs are recommendations, not tested interventions.
The easy way to misread this
Do not conclude that exercise causes weight control or improves health. This survey only reports what people said they did, and it gives no follow-up on effects.