Hargreaves & Samani, 1982

3.69

0.87

0.23

Annandale, 2002

3.69

0.87

0.18

Bristow & Campbell, 1984

3.69

0.87

0.30

Donatelli & Capbell, 1998

3.77

0.86

0.26

Goodin, 1999

3.73

0.87

0.33

Winslow, 2001

3.67

0.87

0.19

Mahmood & Hubbard, 2002

4.13

0.86

0.54