Heart rate

Coefficient

Standard error

z value

Probability > z

Levels 1 - 2

2.08

5.28

0.39

0.693

Levels 2 - 3

1.19

5.38

0.22

0.824

Levels 3 - 4

1.38

5.20

0.27

0.790

Levels 4 - 5

1.82

5.38

0.34

0.735

Levels 5 - 6

1.91

6.81

0.28

0.779

Levels 6 - 7

2.25

6.81

0.33

0.741

Levels 7 - 8

1.62

5.20

0.31

0.755

Adding ages

0.29

0.56

0.52

0.602

Adding heights

−78.84

383.31

−0.21

0.837

Adding weights

0.15

4.39

0.04

0.971

Adding body mass indexes

−3.61

13.48

−0.27

0.789