Table 4 Results from Trend Analyses testing Linear, Quadratic, Cubic, Furth-order and Fifth-order Terms

Physical Activity

 Strenuous and moderate activities (energy expenditure)

436.20***

20.06***

3.29

17.71***

54.54***

 Strenuous, moderate, and mild activities (energy expenditure)

573.65***

16.05***

7.23**

19.81***

62.96***

Social-cognitive variables

 Barriers

219.68***

1.06

0.06

16.71***

17.27***

 Intrinsic motivation

240.98***

6.28*

3.68

12.37***

6.00**

 Plans

141.67***

29.67***

3.80

11.57**

0.79

 Health outcome

 Fitness

171.77***

0.50

0.76

7.16**

1.66

 Health satisfaction

90.88***

1.87

2.67

3.18

10.04**