Table 3

Variables that contribute to baseline Roland-Morris motor limitation subscale score.
Quantitative variable
 N
 Mean
 STD
 Correlation (r) with baseline Roland-Morris
 R2
 p-value
SF-36 Vitality
 309
 40.00
 21.74
 -0.5384
 0.2898
 <0.0001
SF-36 Emotional Role
 306
 51.74
 42.84
 -0.3410
 0.1163
 <0.0001
Age
 311
 42.03
 10.90
 -0.0368
 0.0014
 0.5175




Baseline Roland-Morris

Categorical variable
 Category
n
 Mean
 STD

Med vs. surgical treatment
 Surgical
183
 12.38
 3.12
 0.1605
 <0.0001

Medical
128
 9.02
 4.60

Workman's compensation
 Yes
114
 11.67
 3.77
 0.0154
 0.0288

No
197
 10.60
 4.29

Marital status
 Married/living together
244
 11.00
 4.18
 0.0244
 0.0223

Never Married
29
 9.38
 4.35


divorced/separated/widow
38
 12.18
 3.30

Neurological exam deficits
 0
76
 9.74
 4.51
 0.0431
 0.0037
     each class
 1
106
 10.98
 4.36

     (motor, sensory, reflex)
 2
97
 11.64
 3.50

     counts for1
 3
31
 12.45
 3.21

Sex
 Male
189
 11.01
 4.17
 0.0000
 0.9505

Female
122
 10.98
 4.09

R-square from the model including all above eight variables (n = 302 patients, model df = 9)
 0.4420

Note: In the Maine Lumbar Spine Study, patients were asked to answer yes or no to each question to describe their condition "today," at study entry after referral to a specialist for acute or subacute sciatica. The total score is the number of items answered "yes." We selected the items in bold type as a "movement impairment" subscale.

Mishra et al. Molecular Pain 2007 3:20   doi:10.1186/1744-8069-3-20