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TABLE 2

—Means and Standard Deviations or Percentages of Postrandomization Variables, by Assigned Provider Group

Assigned Provider Group
VariableMedical (n = 340)Chiropractic (n = 341)P valuea
Mean satisfaction score (SD)30.6 (7.1)36.1 (5.4)< .001
Mean no. of items of self-care adviceb (SD) 1.6 (1.6) 2.3 (1.4)< .001
Mean no. of classes of medication recommended (SD) 1.3 (0.8) 0.1 (0.3)< .001
% reporting explanation of treatment1661< .001
% reporting past benefit from assigned treatmentc7550< .001
% reporting any experience with assigned treatmentc9156< .001
% reporting past benefit from assigned treatment (among patients having experience with assigned treatment)c,d8390 .03
% with any radiological study 4 3 .3
Mean improvement in disability scoree (SD) 1.9 (4.9) 2.0 (4.7) .8
Mean improvement in average paine (SD) 0.6 (2.0) 0.7 (2.0) .4
Mean confidence in treatmentc (SD) 6.7 (2.7) 6.9 (2.4) .2
Mean co-payment per visit, $ (SD) 4.6 (5.1) 4.6 (5.6)1.0
Mean visit duration, min (SD)14.4 (8.1)14.7 (8.3) .6
Mean no. of back pain visits to primary provider (SD) 1.1 (0.5) 2.7 (1.5)< .001

Note. Variables were measured at 4 weeks (or over the 4-week interval) unless otherwise noted.

aFor t test (continuous variables) or χ2 test (dichotomous variables) of no difference between groups.

bMore patients in the chiropractic than in the medical group reported receiving advice about back exercises (odds ratio [OR] = 7.4; 95% confidence interval [CL] = 5.1, 11), heat (OR = 2.7; 95% CI = 2.0, 3.8), and pain management (OR = 2.1; 95% CI = 1.5, 3.0). For other types of advice, the ORs of reporting advice were similar for chiropractic vs medical patients (adjusted OR for receiving any of the remaining types of advice = 0.94; 95% CI = 0.78, 1.1; P > .05 for Woolf’s test for homogeneity).

cMeasured at baseline. For patients assigned to the chiropractic group, past benefit could be from chiropractic or from other complementary and alternative therapies.

dn = 309 for medical group; n = 192 for chiropractic group.

eChange between scores measured at baseline and 2 weeks. A positive score indicates improvement.

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