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Table 4

Stratified Analyses

 β-Coefficient*p value†
Stratified Analysis Showing Differences in the Association Between General Expectation and Change in Roland Score in Usual Care versus Choice Groups at 5 Weeks
Usual Care0.95.0016
Choice0.55.03
Interaction Term‡N/A.27
Stratified Analysis Showing Differences in the Association Between General Expectation and Change in Roland Score in Usual Care versus Choice Groups at 12 Weeks
Usual Care0.800.007
Choice0.290.30
Interaction Term‡N/A0.068
*The β-coefficient is measuring the magnitude of the association between general expectation and the outcome (Roland score).

†The p value is a measure of the significance of the association between general expectation and the outcome (Roland score).

‡The interaction term is the product of the usual care versus choice variable with the general expectation variable.