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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: Am J Health Behav. 2014 May;38(3):465–477. doi: 10.5993/ajhb.38.3.15

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.

a

Not significant (borderline)

b

Convergence criteria satisfied