Table 4

Cross-sectional associations (Prevalence Ratios) between restless legs syndrome* and functional limitations in the Health and Retirement Study 2002 survey (N = 1008)
Functional Limitation Outcome Total (N) Limited (N) % PR* 95% CI P
Mobility limitations (At least 1) 1008 454 45.0 1.25 (1.08, 1.46) 0.004
Some difficulty walking several blocks 994 273 27.5 1.43 (1.12, 1.82) 0.004
Difficulty climbing several flights 900 408 45.3 1.16 (0.98, 1.36) 0.09
Large muscle group limitations (At least 1) 1008 611 60.6 1.20 (1.06, 1.36) 0.004
Some difficulty sitting for 2 hours 997 191 19.2 1.29 (0.95, 1.76) 0.11
Some difficulty rising from chair 1007 397 39.4 1.20 (0.96, 1.49) 0.11
Difficulty with stooping 997 451 45.2 1.15 (0.96, 1.38) 0.14
Pushing or pulling a large object 957 227 23.7 1.56 (1.18, 2.07) 0.002
Gross motor limitations† (At least 1) 1008 222 22.0 1.13 (0.86, 1.49) 0.37
Fine motor limitations‡ (At least 1) 1008 112 11.1 1.42 (0.89, 2.26) 0.14
Difficulty reaching or extending arms up 1007 139 13.8 1.68 (1.10, 2.55) 0.02
ADL limitations (At least 1) 1008 136 13.5 1.46 (1.00, 2.11) 0.05
Specific ADLs
Dressing oneself 1008 74 7.3 2.23 (1.26, 3.95) 0.006
Bathing oneself 1008 53 5.3 1.69 (0.80, 3.59) 0.17
Transferring into or out of bed 1007 46 4.6 2.07 (1.01, 4.23) 0.05
Toileting 1008 51 5.1 2.16 (1.04, 4.52) 0.04
IADL limitations (At least 1) 1008 97 9.6 1.71 (1.13, 2.59) 0.01
Specific IADLs
Using a telephone 1008 20 2.0 0.26 (0.06, 1.22) 0.09
Preparing Meals 952 43 4.5 2.96 (1.47, 5.95) 0.002

* Restless Legs symptoms defined as unpleasant or restless sensations in the legs at least once per week, and reporting “restless, fidgety, or unable to sit still” feelings at rest and the need to “move, rub, or stretch legs” (n = 104). Adjusted for significant covariates from analysis in Table 3, including: age, gender, income category (quartiles), health interfering with ability to work, pain symptoms (mild-moderate or severe compared to none), other sleep symptoms (walking too easily or too early), body mass index, current drinking status, number of chronic medications used, out-of-pocket medical expenses (quartiles), number of doctor visits in the last 2 y, and falls in the previous 2 y.

† Gross motor limitations defined as at least some difficulty in one of these domains: Walking 1 block, walking with an assistive device, climbing 1 flight of stairs, transferring, or bathing.

‡ Fine motor limitations defined as at least some difficulty in one of these domains: Picking up a dime, feeding oneself, or dressing oneself.

Abbreviations: PR = prevalence ratio; CI = confidence interval; ADL = Activities of Daily Living; IADL = Instrumental Activities of Daily Living; y = years.

Cirillo and Wallace

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

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