Table 3 Action theory test, conceptual theory test and significance of the mediated effect on physical activity (step count) – Baseline to 3-months (April - June, 2011) and baseline to 6-months (April - December, 2011) Australia

Self Efficacy

1

0.04 (0.08)

0.62

1012 (635)

0.11

4368 (621)

<0.001

41 (107)

−107 to 357

1%

2

0.18 (0.11)

0.10

1081 (587)

0.68

3168 (725)

<0.001

190 (168)

−9 to 717

6%

Enjoyment

1

−0.16 (0.11)

0.14

860 (487)

0.08

4233 (625)

<0.001

−140 (138)

−697 to 19

3%

2

−0.23 (0.11)

0.05

1002 (527)

0.06

3775 (688)

<0.001

−226 (168)

−732 to 7

6%

Social Support (Friends)

1

0.01 (0.12)

0.91

407 (446)

0.36

4034 (605)

<0.001

−90 (70)

−89 to 247

2%

2

0.21 (0.14)

0.14

497 (426)

0.25

3423 (703)

<0.001

106 (125)

−34 to 573

3%

Social Support (Family)

1

0.03 (0.11)

0.82

612 (450)

0.18

3911 (605)

<0.001

16 (86)

−112 to 266

<1%

2

0.06 (0.12)

0.64

516 (515)

0.32

3402 (694)

<0.001

29 (102)

−100 to 411

<1%

Social Support (Teacher)

1

−0.12 (0.15)

0.43

−257 (337)

0.45

3937 (617)

<0.001

32 (78)

−49 to 357

<1%

2

0.54 (0.17)

<0.001

828 (369)

0.03

3037 (714)

<0.001

445 (242)

77 to 1068

13%

School Environment

1

0.28 (0.07)

<0.001

−605 (733)

0.41

4037 (680)

<0.001

−172 (187)

−574 to 173

4%

2

0.58 (0.09)

<0.001

742 (723)

0.31

2933 (836)

<0.001

434 (459)

−415 to 1507

13%

Multi-mediation (all)

2

3009 (894)

<0.001

390 (570)

−658 to 1714

11%