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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 CategoryMedicalChiropracticChiropractic–Medical Difference (95% CI)
Self-care adviceb
    0–1 items28.332.44.0 (2.1, 6.0)
    2–3 items32.734.41.7 (–0.2, 3.7)
    ≥ 4 items36.136.80.7 (–1.6, 3.1)
Explanation of treatmentc
    No31.233.92.6 (0.8, 4.4)
    Yes35.336.61.3 (–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.

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