Table 2.

Results of the Structural Equation Model for Predicting T2 Adherence

	Without Demographics			With Demographics
	b	β	SE	b	β	SE
T1 Adherence on
T1 Difficulty	−0.302***	−0.433	0.034	−0.299***	−0.430	0.035
Trait Boredom	0.069	0.092	0.051	0.065	0.087	0.049
Trait Self-Control	0.189*	0.164	0.075	0.203**	0.177	0.074
Trait Self-Control X T1 Difficulty	0.105*	0.106	0.045	0.110**	0.111	0.042
Trait Planning	0.455***	0.339	0.073	0.452***	0.340	0.070
Trait Planning X T1 Difficulty	0.156*	0.142	0.070	0.167**	0.153	0.064
R2	0.293
T1 Difficulty on
Trait Boredom	0.702***	0.652	0.031	0.715***	0.664	0.033
R2	0.425
T2 Adherence on
T2 Difficulty	−0.086*	−0.126	0.042	−0.080†	−0.117	0.042
T1 Adherence	0.563***	0.571	0.082	0.556***	0.562	0.083
T1 Difficulty	−0.092†	−0.133	0.049	−0.112*	−0.163	0.051
Intervention	0.071	0.044	0.055	0.073	0.045	0.056
SBPS	0.049	0.067	0.041	0.044	0.059	0.044
CFSCS	0.018	0.015	0.060	0.003	0.002	0.061
CFSCS x T1 Difficulty	−0.020	−0.020	0.040	−0.026	−0.027	0.042
ITPS	0.138*	0.104	0.061	0.161*	0.122	0.062
ITPS x T1 Difficulty	0.090†	0.083	0.049	0.115†	0.106	0.051
R2	0.507
T2 Difficulty on
T1 Adherence	−0.089†	−0.061	0.047	−0.083†	0.194	0.047
T1 Difficulty	0.682***	0.677	0.045	0.676***	−0.057	0.045
Intervention	0.050	0.021	0.064	0.036	0.671	0.064
SBPS	0.182***	0.167	0.045	0.211***	0.015	0.047
R2	0.675
Fit statistics	χ2(8)	p	RMSEA	χ2(8)	p	RMSEA
	11.28	.186	0.027	10.27	.247	0.022
	CFI	TLI	SRMR	CFI	TLI	SRMR
	0.996	0.987	0.020	0.998	0.980	0.007

Note: SBPS = Short Boredom Proneness Scale; CFSCS = Capacity for Self-Control Scale; ITPS = If-Then Planning Scale; RMSEA = Root Mean Square Error of Approximation; CFI = Comparative Fit Index; TLI = Tucker-Lewis Index; SRMR = Standardized Root Mean Square Residual. We report unstandardized (b) and standardized coefficients (β) with robust standard errors (SE). Missing data was dealt with using full-information maximum likelihood (FIML)

^†p < .1. ^*p < .05. ^**p < .01. ^***p < .001