Comparing the Satisfaction of Low Back Pain Patients Randomized to Receive Medical or Chiropractic Care: Results From the UCLA Low-Back Pain Study

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Am J Public Health. 2002 October; 92(10): 1628–1633.

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TABLE 4

—Estimated Adjusted Mean Satisfaction Score,^a by Assigned Provider Group and Category of Each Communication Covariate, and Estimated Difference (With 95% Confidence Interval [CI]) in Satisfaction Score Between Chiropractic and Medical Patients, by Covariate Category: Results of Fitting 2 Mixed Linear Models (n = 672)

	Assigned Provider Group
Covariate Category	Medical	Chiropractic	Chiropractic–Medical Difference (95% CI)
Self-care advice^b
0–1 items	28.3	32.4	4.0 (2.1, 6.0)
2–3 items	32.7	34.4	1.7 (–0.2, 3.7)
≥ 4 items	36.1	36.8	0.7 (–1.6, 3.1)
Explanation of treatment^c
No	31.2	33.9	2.6 (0.8, 4.4)
Yes	35.3	36.6	1.3 (–0.8, 3.4)

^aSatisfaction scores are adjusted for all other covariates in Model 3 of Table 3 ▶. The first model includes interaction (product) terms for assigned provider group and the level of self-care advice; the second includes interaction terms for assigned provider group and category of explanation (yes or no). In both models, random effects were used to model differences among individual providers.

^bFor the null hypothesis that the satisfaction differences at all 3 levels of self-care advice are equal, the P value is .004.

^cFor the null hypothesis that the satisfaction differences at both levels of explanation of treatment are equal, the P value is .07.