Table 2.

Multivariable Logistic Regression of Likelihood of Improvement

Variable	Odds Ratio (95% CI)*	P value
Treatment group	2.16 (1.14 to 4.10)	.019
Education, at least 16 years	2.39 (1.13 to 5.06)	.022
Mental health (SD = 19.70)	2.14 (1.49 to 3.09)	< 0.001
Physical function (SD = 26.13)	0.56 (0.38 to 0.82)	.003
Body pain (SD = 20.48)	1.51 (1.02 to 2.23)	.039

^*OR for continuous variables presented for a 1-SD lower score; c-statistic = 0.75; Hosmer–Lemeshow test (P = .81).