Table 3.

Longitudinal Regression Model for Outcome: Stage of Change

Effect	b	se	t	p
Intercept Stage 2	1.43	1.73	.82	.41
Intercept Stage 3	6.19	1.84	3.36	.00
Intercept Stage 4	3.29	1.74	1.90	.06
Intercept Stage 5	−.02	1.73	−.01	.99
TR dose	.04	.10	.38	.71
TR Condition (Phone or No phone reinforcement)	−.09	.33	−.26	.80
Maintenance Treatment Arm (Negotiated-Mainstreamed)	−.28	.33	−.85	.40
Timepoint (baseline,2,6,12,18 months)	−.02	.07	−.33	.74
Sex	.33	.33	1.02	.31
Education	.07	.11	.70	.49
Race	.17	.47	.36	.72
Income	−.04	.08	−.55	.58
Age	.02	.02	1.16	.25
Arthritis functional class	−.43	.24	−1.85	.07
Body mass index (BMI)	−.41	.16	−2.65	.01
Arthritis	−.20	.51	−.40	.69
High blood pressure	.13	.24	.55	.58
Vision problems	.02	.22	.11	.91
Diabetes	−.02	.27	−.08	.94
Interactions
TR Condition* Maintenance Treatment Arm	.41	.48	.87	.39
TR Condition * Timepoint	.16	.08	1.93	.06a
Maintenance Treatment Arm * Timepoint	.18	.07	2.46	.02
TR Condition * Maintenance Treatment Arm * Timepoint	−.27	.10	−2.77	.01
Log likelihood	10,655.30b
Iterations	32
Covariance Parameter Estimates	b	se
Intercept	1.412300	.315800
Timepoint	.003918	.005793

Note.

^aNot significant (borderline)

^bConvergence criteria satisfied