Reliability of two difficulty indexes in predicting the surgical extraction difficulty of impacted mandibular third molars | Journal of Oral Medicine and Oral Surgery

Open Access

Table V

The agreement between the Pederson and the Pernambuco indexes.

		Pernambuco index

		Low	Moderate	High	Total
Pederson index	Low	9	7	0	16
	Moderate	14	32	0	46
	High	7	14	0	21
	Total	30	53	0	83
Agreement		9	32	0	41
By chance		5.78	29.37	0	35.16

Cohen's kappa: 0.1221.

Poor agreement.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.