High prevalence of restless legs syndrome among women with multi-site pain: a population-based study in Dalarna, Sweden.
BACKGROUND
The chronic pain (CP) and chronic multi-site pain (CMP) condition is a highly prevalent health problem. Several studies have reported a high (31-64%) prevalence of co-morbid restless legs syndrome (RLS) in patients with fibromyalgia, one specifically defined form of chronic widespread pain. The current study explored the association between CMP and RLS.


METHODS
The study included 4040 respondents to a postal questionnaire sent to 10,000 women in the age range of 18-64 years and randomly selected from the general population. Complete questionnaire data on type (acute/chronic), degree (mild to severe) and spreading (0-5 body zones) of pain, as well as RLS symptoms (validated questionnaire), were obtained from 3060 subjects. Information on lifestyle, anthropometrics, co-morbidities and medication was collected.


RESULTS
RLS prevalence increased from 9.6% in subjects with no report of pain to 23,9%, 26.4%, 39.2%, 44.9% and 54.8% in those reporting one, two, three, four and five pain areas, respectively (p < 0.001). Further, RLS prevalence increased from 9.6% (no pain) to 27.9%, 37.9% and 42.4% in subjects with mild, moderate and severe chronic pain (p < 0.001). Multi-site pain, pain localized in the leg, extended pain duration and co-morbid psychiatric disorder were all independently associated with a RLS diagnosis in a multiple regression analysis.


CONCLUSIONS
The prevalence of RLS increased progressively with pain severity and even more sharply with the degree of pain spreading in women recruited from the general population. Both acute and chronic pain was associated with RLS-related symptoms.
Pain Center, Skonvik Medical Rehabilitation Clinic, Säter, Sweden; Center for Sleep and Vigilance Disorders, Sahlgrenska Academy, Gothenburg University, Sweden.
R
R
Stehlik
J
J
Ulfberg
J
J
Hedner
L
L
Grote
D000293:Adolescent; D000328:Adult; D001007:Anxiety / Q000453:epidemiology; D059350:Chronic Pain / Q000453:epidemiology*; D015897:Comorbidity; D003863:Depression / Q000453:epidemiology; D005260:Female; D006801:Humans; D016015:Logistic Models; D001523:Mental Disorders / Q000453:epidemiology*; D008875:Middle Aged; D015999:Multivariate Analysis; D010147:Pain Measurement; D015995:Prevalence; D012148:Restless Legs Syndrome / Q000453:epidemiology*; D012720:Severity of Illness Index; D012893:Sleep Wake Disorders / Q000453:epidemiology; D011795:Surveys and Questionnaires; D013548:Sweden / Q000453:epidemiology; D055815:Young Adult