Table 3

Corrected item total correlation and Cronbach’s alpha of OIDP by number of types of OML
No OML (N = 226) Cronbach's Alpha (Standardized Items) = 0.811
OIDP items Corrected Item-Total Correlation Cronbach's Alpha if Item Deleted
Eating .675 .757
Speaking .447 .792
Cleaning .592 .767
Smiling .269 .808
Sleeping .634 .759
Emotional state .655 .755
Carrying out major work .564 .779
Contact .391 .796
One type of OML (N = 196)
Cronbach's Alpha (Standardized Items) = 0.894
Eating .721 .867
Speaking .586 .878
Cleaning .713 .865
Smiling .614 .876
Sleeping .715 .865
Emotional state .680 .870
Carrying out major work .646 .874
Contact .683 .870
> One type of OML (N = 111)
Cronbach's Alpha (Standardized Items) = 0.921
Eating .700 .909
Speaking .711 .906
Cleaning .751 .902
Smiling .657 .910
Sleeping .751 .902
Emotional state .779 .900
Carrying out major work .766 .903
Contact .747 .904
Total study population (N = 533)
Cronbach's Alpha (Standardized Items) = 0.890
Eating .694 .863
Speaking .606 .869
Cleaning .692 .859
Smiling .572 .872
Sleeping .698 .858
Emotional state .703 .858
Carrying out major work .671 .864
Contact .642 .866

Suliman et al.

Suliman et al. BMC Oral Health 2012 12:19   doi:10.1186/1472-6831-12-19

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