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Table 4 Mediation of change in behavioral determinants between intervention and MVPA change (18 months, n = 240)

From: Determinants of lifestyle behavior change to prevent type 2 diabetes in high-risk individuals

T0–T2

MVPA (# times, 30 min per week)

X -- > Y (c path) a,h

     
 

B(SE)

95%-CI

       

Crude analysis

1.7 (0.5)

0.6; 2.7

       
 

X -- > Y (c’ path) direct b,h

X -- > M (a path) c,h

M -- > Y (b path) d,h

Indirect effect (a*b) e,g

Proportion mediated f

 

B (SE)

95%-CI

B (SE)

95%-CI

B (SE)

B (SE)

95%-CI

B (SE)

95%-CI

Intention

1.6 (0.5)

0.5; 2.6

0.2 (0.2)

−0.1; 0.5

0.5 (0.2)

0.0; 0.9

0.1 (0.1)

0.0; 0.4

-

Attitude

1.5 (0.5)

0.4; 2.5

0.2 (0.1)

−0.1; 0.4

0.5 (0.3)

−0.02; 1.1

0.1 (0.1)

0.0; 0.4

-

Social influence

1.6 (0.5)

0.6; 2.7

0.2 (0.1)

0.0; 0.5

0.1 (0.3)

−0.5; 0.6

0.0 (0.1)

−0.1; 0.2

-

Self-efficacy

1.5 (0.5)

0.4; 2.5

0.2 (0.1)

0.0; 0.5

0.7 (0.3)

0.1; 1.

0.2 (0.1)

0.0; 0.5

-

Motivation

1.4 (0.5)

0.4; 2.5

0.3 (0.2)

0.0; 0.6

0.8 (0.2)

0.4; 1.2

0.2 (0.1)

0.0; 0.6

-

Action control

1.3 (0.5)

0.3; 2.4

0.4 (0.1)

0.1; 0.7

0.8 (0.2)

0.3; 1.2

0.3 (0.1)

0.1; 0.7

0.19

Physical activity skills

1.6 (0.5)

0.5; 2.6

0.3 (0.2)

0.0; 0.6

0.3 (0.2)

−0.1; 0.8

0.1 (0.1)

0.0; 0.4

-

Psychological profile

1.4 (0.5)

0.3; 2.4

1.9 (0.7)

0.5; 3.3

0.1 (0.1)

0.1; 0.2

0.3 (0.1)

0.1; 0.6

0.17

  1. aC path (total effect): the crude association between intervention and PA behavior
  2. bC’ path (direct effect): the association between intervention and PA behavior, adjusted for mediator (behavioral determinants)
  3. cA path: association between intervention and behavioral determinant
  4. dB path: association between behavioral determinant and PA behavior
  5. eIndirect effect (a*b): the indirect effect of the intervention on PA behavior through behavioral determinant
  6. fProportion effect mediated ((a*b)/c): the proportion of the total effect that was mediated through behavioral determinant
  7. gStandard error and confidence interval for indirect effects were calculated with bootstrapping (5000 samples)
  8. hAll analyses used linear regression models