Table 4 Observed correlations for testing the validity of the Dutch version of OSIS

1. OSIS and WOSI

0.82

2. OSIS and SST

0.69

3. OSIS and OSS

0.76

4. OSIS and DASH

0.79

5. OSIS and SF-36 subscales:

 Physical function

0.65

 General health

0.31

 Social function

0.56

 Vitality

0.39

 Mental health

0.20

 Role emotional

0.41

 Role functional

0.69

 Bodily Pain

0.78