Table 2 Relationship between supplement use and subject characteristics

Gender

48

311

0.635

0.427

 Male

34

234

 Female

14

77

Age range

48

357

0.431

2.753

 15-20 yrs

3

49

 21-25 yrs

20

144

 26-30 yrs

21

139

 31-35 yrs

4

25

Occupation

48

311

0.075

18.294

 Manager

2

7

 Professional

9

33

 Technician associate professional

5

64

 Clerical support worker

10

21

 Service & sales worker

8

45

 Skilled agriculture, forestry & fishery worker

2

14

 Craft & related trades worker

1

15

 Plant & machine operator

1

11

 Elementary occupation

2

30

 Student

7

65

 Unemployed

1

5

Sport played

48

311

<0.0001

61.101

 Volleyball

5

41

 Rugby

14

30

 Netball

1

44

 Basketball

18

26

 Boxing

0

45

 Athletics

5

40

 Cycling

5

40

 Football

0

45

Duration playing sport

47

306

0.024

7.460

 <5 yrs

5

81

 5-10 yrs

37

179

 >10 yrs

5

46

Level of competition

48

311

0.750

0.101

 National

45

295

 International

3

16

Education level

48

307

<0.0001

33.377

 Preschool/nursery

0

2

 Primary school

0

10

 Secondary school

3

144

 Tertiary

45

151