Table 1

Characteristics of 2002 Health and Retirement Study restless legs syndrome module (N = 1,008)
Variable Included (n = 1008) (%*) RLS (n = 104) (%*) No RLS (n = 904) (%*)
Age
 Age 54–64 y 374 46.6 43 52.5 331 45.9
 Age 65–79 y 482 40.2 49 37.0 433 40.6
 Age 80 y or older 152 13.2 12 10.5 140 13.5
Gender
 Male 430 44.4 26 29.2 404 46.2
 Female 578 55.6 78 70.8 500 53.8
Self-reported Race / Ethnicity
 White, Non-Hispanic 795 84.3 82 86.3 713 84.1
 Black, Non-Hispanic 138 8.8 17 8.0 121 8.9
 Other 75 6.9 5 5.6 70 7.0
Education
 Less than High School 218 17.4 31 23.2 187 16.7
 High School / Equivalent 386 37.8 45 46.0 341 36.8
 Some College 205 22.5 17 18.3 188 23.0
 College Graduate 199 22.3 11 12.5 188 23.5
Income
 Less than $17,600 256 22.5 41 32.7 215 21.3
 $17,000 - $33,175 249 21.5 34 30.8 215 20.5
 $33,176 - $63,079 259 25.7 15 15.0 244 27.0
 $63,080+ 244 30.2 14 22.0 230 31.2
Currently Employed 354 41.7 20 24.8 334 43.8
Health Limits Ability to Work 289 25.8 71 68.8 218 20.8
Doctor Visits (In previous 2 y) †
 0-3 Doctor Visits 294 30.6 25 22.1 269 31.6
 4-7 Doctor Visits 270 26.4 17 18.9 253 27.3
 8-11 Doctor Visits 181 17.5 22 24.9 159 16.7
 12 or More Doctor Visits 263 25.4 40 34.1 223 24.4
Hospitalized (In previous 2 y) † 260 23.0 36 34.0 224 21.8
Self-Report of No Medical Plan 69 7.4 11 11.5 58 6.9
BMI
 < 25.0 345 35.1 25 21.9 336 38.5
 25.0-29.9 418 42.0 44 44.0 358 39.9
 30.0 or greater 245 23.0 35 34.0 210 21.6
Smoking Status
 Never Smoker 403 40.0 38 34.0 365 40.8
 Former Smoker 456 45.3 46 49.1 410 44.8
 Current Smoker 149 14.7 20 16.9 129 14.4
Alcohol Consumption
 Non-drinker 525 48.6 77 70.5 448 46.0
 Current Consumption 483 51.4 27 29.6 456 54.0
Vigorous Activity (3 times per week) † 427 44.4 34 34.5 393 45.6
Falls (In previous 2 y) ‡
 None 824 83.9 74 74.6 750 85.1
 Once 103 9.3 12 10.3 91 9.1
 2 or More Times 81 6.8 18 15.1 63 5.8
Self-Reported Health
 Very Good / Excellent 417 43.8 17 16.0 400 47.1
 Good 342 35.3 28 34.3 314 35.4
 Fair / Poor 249 20.9 59 49.6 190 17.5
Self-Reported Pain
 None 733 73.9 28 29.8 705 79.1
 Mild-Moderate 111 10.4 20 16.9 91 9.6
 Severe 164 15.7 56 53.3 108 11.3
Self-Reported Medical Conditions
Hypertension 520 48.9 66 60.5 454 47.5
Diabetes 164 15.7 32 31.9 132 13.8
Cancer 134 12.7 14 10.6 120 13.0
Lung Disease 82 7.3 21 17.6 61 6.1
Heart Disease 241 21.6 40 38.2 201 19.6
Stroke 63 5.2 8 6.9 55 5.0
Psychiatric Disease 128 13.2 33 34.1 95 10.7
Arthritis 592 54.5 87 83.1 505 51.1
Self-Reported Chronic Medications
 None 314 33.8 15 15.0 299 36.1
 One Chronic Medication 330 33.5 18 20.4 312 35.0
 Two Chronic Medications 214 19.0 26 22.2 188 18.6
 Three or More Chronic Medications 150 13.7 45 42.4 105 10.3
Depressive Symptoms (CES-D ≥ 2) ‡ 219 19.8 57 46.6 162 16.6
ADL Limitation (≥ 1 impairment) ‡ 136 12.4 40 39.2 96 9.2
IADL Limitation (≥ 1 impairment) ‡ 97 8.6 34 30.6 63 6.0
Mobility Limitation (≥ 1 impairment) ‡ 454 41.3 91 87.6 363 35.8
Large Muscle Limitation (≥ 1 impairment) ‡ 611 56.7 98 95.1 513 52.2
Gross Motor Limitation (≥ 1 impairment) ‡ 222 20.1 61 56.1 161 15.8
Fine Motor Limitation (≥ 1 impairment) ‡ 112 10.1 26 28.7 86 7.9

Abbreviations: y = Years; ADL = Activities of Daily Living; IADL = Instrumental Activities of Daily Living; BMI = Body Mass Index; CES-D = Center for Epidemiologic Studies Depression Scale.

* Percentage based on sampling weight to reflect U.S. population aged 54 or older at baseline, reflected in the underlying Health and Retirement Study cohort.

† χ2 test for association in all nominal variables and test for trend in all ordinal variables, p < 0.05; ‡ p < 0.001.

Cirillo and Wallace

Cirillo and Wallace BMC Geriatrics 2012 12:39   doi:10.1186/1471-2318-12-39

Open Data