Table IV.

Longitudinal mediation path analysis for past 30-day smoking frequency

Model path	B	SE	95% CI for B	β	Percent mediated^†	R²
PSS model
MAAS→PSS	−0.147	0.016	(−0.115, −0.179)	−0.178^*
PSS→Smoking	0.034	0.010	(0.014, 0.055)	0.048^*
MAAS→Smoking	0.002	0.011	(−0.019, 0.023)	0.003
Indirect effect	−0.005	0.002	(−0.002, −0.008)	−0.009^*	100
Model R² for PSS						0.221
Model R² for smoking						0.476
CESD model
MAAS→CESD	−0.129	0.013	(−0.104, −0.155)	−0.165^*
CESD→Smoking	0.025	0.009	(0.007, 0.043)	0.033^*
MAAS→Smoking	−0.002	0.010	(−0.022, 0.019)	−0.003
Indirect effect	−0.003	0.003	(−0.011, 0.000)	−0.005^**	100
Model R² for CESD						0.187
Model R² for smoking						0.475
AQ model
MAAS→AQ	−0.079	0.019	(−0.041, −0.116)	−0.082^*
AQ→Smoking	0.019	0.007	(0.005, 0.033)	0.031^**
MAAS→Smoking	−0.004	0.010	(−0.024, 0.016)	−0.007
Indirect effect	−0.001	0.001	(−0.007, 0.000)	−0.003^***	100
Model R² for AQ						0.193
Model R² for smoking						0.475

Notes: MAAS, Mindful Attention Awareness Scale; CESD, Center for Epidemiologic Studies Depression Scale; PSS, Perceived Stress Scale; AQ, Aggression Questionnaire.

^†

Percent mediated = indirect effect/total effect. Each model is adjusted for age, gender, parent education, school type, mediator score, treatment exposure and smoking frequency at baseline. Mediator assessed at 3 months post-baseline and outcome assessed at 13 months post-baseline. Hierarchical models are used to account for students nested within schools.

p < 0.01,

^**

p < 0.05,

^***

p < 0.10.