. Author manuscript; available in PMC: 2016 Oct 1.

Published in final edited form as: J Oral Facial Pain Headache. 2015 Fall;29(4):349–362. doi: 10.11607/ofph.1463

Table 3.

Comparison of Extent of Brain Activation

	Unpaired			P value^*
	PDAP (n = 13)	Control subjective- pain match (n = 13)	Control stimulus- intensity match (n = 12)	PDAP × Control subjective-pain match	PDAP × Control stimulus-intensity match
Median activation extent (voxels)^†	20,841	15,176	7,442	.479 (U = 70.5, z = −0.72, r = −0.14)	.123 (U = 49.5, z = −1.553, r = −0.31)

Mann-Whitney U test, 2-tailed, Exact test.

^†

Voxel size = 1 mm³.

z = U test statistic z-score; r = effect size estimate.