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Table 5 Summary statistics for hierarchical linear regression analyses determining statistical predictors of intention to use protein powder

From: Muscle building supplement use in Australian adolescent boys: relationships with body image, weight lifting, and sports engagement

 

R2

∆R2

∆F

B

SEB

β

p

Step 1

.02

.02

1.29

    

 Age

   

−0.50

0.27

−.13

.061

 BMI

   

0.002

0.04

.00

.958

 Ethnicity

   

0.16

0.30

−.04

.595

Step 2

.10

.09

11.00***

    

 Age

   

−0.31

0.26

−.08

.235

 BMI

   

0.02

0.04

.04

.580

 Ethnicity

   

0.18

0.29

.04

.636

 Muscularity (beliefs)

   

0.56

0.12

.33

< .001

 Body esteem

   

0.03

0.02

.09

.176

Step 3

.30

.19

28.91***

    

 Age

   

−0.19

0.23

−.05

.416

 BMI

   

−0.01

0.04

−.02

.746

 Ethnicity

   

0.04

0.26

−.009

.884

 Muscularity (beliefs)

   

0.37

0.11

.22

.001

 Body esteem

   

0.02

0.02

.07

.279

 Number of sports

   

0.21

0.09

.14

.019

 Weight training

   

1.78

0.26

.41

< .001

  1. *p < .05, **p < .01, ***p < .001
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BMC Pediatrics

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