Reliability and validity of measuring scale for postoperative complications in third molar surgery

BMC Oral Health

Table 5 Grouping of the items in the scale components, their factor loadings (Cronbach’s alpha), internal consistency, indexes of reliability, convergent and discriminant validity obtained by means of the exploratory factor analysis

Components	Composite Alpha	Extracted variance	Interobserver Reliability^a	Item	Stand^b	Var. Error	Factor loading^c	Convergent validity^d	Discriminant validity
Component 1	0.79	0.56	84.9	Inflammation	0.59	0.65	0.59	4.64	0.50
				Edema	0.74	0.45	0.74	6.11
				Pain	0.89	0.21	0.81	6.68
Component 2	0.71	0.55	87.9	Abscess	0.71	0.49	0.78	5.24
Component 2	0.71	0.55	87.9	Alveolar osteitis	0.78	0.39	0.78	5.74

^aIntraclass correlation > 80%
^bFor selecting the item, the stand must be greater than the extracted variance of each component
^cCronbach’s alpha > 0.7
^dFactor loading with statistical significance student’s t > 1.96

ISSN: 1472-6831