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Prevalence and Characteristics of Restless Legs Syndrome in Korean Adults: A Study in Two Independent Samples of the General Population.

Neuroepidemiology. 2019 Feb 14;52(3-4):193-204

Authors: Kim TJ, Yoon JE, Park JA, Lee SK, Chu MK, Yang KI, Kim WJ, Park SH, Thomas RJ, Shin C, Yun CH

Abstract
BACKGROUND: Restless legs syndrome (RLS) is a common sleep disorder, although it has a low prevalence in Asian populations. However, the reported RLS prevalence in -Korean adults is mostly 4.5-12.1%, which is higher than that reported in other Asian populations. This study aimed to diagnose RLS and exclude mimicking conditions in 2 independent samples of Korean adults, and to compare its prevalence to that from previous studies performed in Asian countries.
METHODS: Study populations included a (1) nationwide stratified random sample (n = 2,824; age 19-79 years) and (2) community-based cohort (n = 2,685; age 47-79 years). We applied the Cambridge-Hopkins diagnostic questionnaire to diagnose RLS and differentiate it from RLS mimics. Sleep-related symptoms, mood, and medical conditions were compared between the RLS and non-RLS groups. Prior studies of the RLS prevalence in Asia were systematically reviewed and compared to our findings.
RESULTS: The adjusted RLS prevalence was 0.4 and 1.3% in populations 1 and 2, respectively. In both populations, subjects with RLS had more depression. The prevalence of RLS mimics was 5.1 and 2.6%, in populations 1 and 2, respectively. The RLS prevalence in Asia was higher when RLS was defined by the presence of essential clinical features and lower when a differential diagnosis was additionally implemented.
CONCLUSIONS: The RLS prevalence in Korean adults considering RLS mimics is comparable to that in adults from other Asian countries (< 2%). The reported RLS prevalence varies depending on the diagnostic method employed.

PMID: 30763945 [PubMed – as supplied by publisher]

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