Noninvasive Characterisation of Foot Reflexology Areas by Swept Source-Optical Coherence Tomography in Patients with Low Back Pain

Table 2

Comparison of the depth of viable epidermis.

Grade	Gender				𝑃 value; (in between male and female SS-OCT images)
	Male		Female
	Sample size of image data (𝑛)	Depth of viable epidermis (μm); Median (range)^†	Sample size of image data (𝑛)	Depth of viable epidermis (μm); Median (range)^†
Grade 0	300	942; (481–1113)	325	575; (497–1170)	0.001
Grade 1	250	820; (354–990)	500	532; (380–676)	0.001
Grade 2	450	602; (287–790)	650	397; (258–569)	0.001
Grade 3	275	242; (134–465)	400	259; (148–468)	0.248
Overall 𝑃 value		0.001		0.001
Post hoc multiple grade comparison
0 versus 1		0.001		0.001
0 versus 2		0.001		0.001
0 versus 3		0.001		0.001
1 versus 2		0.001		0.001
1 versus 3		0.001		0.001
2 versus 3		0.001		0.001

 ^†Values are expressed as median (minimum–maximum).