Table 4 Mean, SD, number of items, observed range, Cronbach's α, and F-values of the SF20 scales observed in the present study and among patients and healthy controls in a comparison study (means with equal upper case superscripts are not significantly different).

Patients ^c

n = 86

Controls ^c

n = 86

Physical functioning^a

(6; 6 - 12; .673)

8.44^A ± 1.58

26.6^B ± 3.7

28.6^C ± 2.1

983.36 **

Role functioning^a

(2; 2 - 4; .766)

2.46^A ± .75

2.8^A ± 1.5

3.7^B ± .7

25.237 **

Social functioning^a

(1; 1 - 6; --)

4.33^A ± 1.21

4.8^A ± 1.7

5.7^B ± .7

20.948 **

Mental health^a

(5; 5 - 30; .933)

21.61^A ± 5.13

22.8^{A, B} ± 5.9

24.6^B ± 3.6

6.417*

Health perceptions^a

(5; 5 - 30; .745)

14.08^A ± 3.91

19.6^B ± 4.3

22.8^C ± 2.4

95.857 **

Pain^b

(1; 1 - 5; --)

3.63^A ± 1.27

2.1^B ± 1.2

1.7^C ±.8

53.909**