Table 4 Internal consistency of the SF-36 for khat and non-khat chewer patients
Dimensions | # Items | Khat Chewers | Non-khat Chewers | ||
|---|---|---|---|---|---|
|  | Cronbach’s alpha | Intra-class correlation | Cronbach’s alpha | Intra-class correlation | |
Physical function (PF) | 10 | 0.950 | 0.654 | 0.867 | 0.395 |
Role physical (RP) | 4 | 0.782 | 0.473 | 0.727 | 0.400 |
Body pain (BP) | 2 | 0.774 | 0.632 | 0.735 | 0.581 |
General health (GH) | 5 | 0.738 | 0.361 | 0.694 | 0.312 |
Mental health (MH) | 5 | 0.911 | 0.672 | 0.737 | 0.360 |
Role-emotional (RE) | 3 | 0.871 | 0.693 | 0.895 | 0.739 |
Social function (SF) | 2 | 0.852 | 0.742 | 0.719 | 0.561 |
Vitality (VT) | 4 | 0.930 | 0.769 | 0.746 | 0.423 |