Treatment with Light-Emitting Diodes of Wavelength 863 nm Delays DMBA/TPA-Induced Skin Tumor Formation and Decreases Proinflammatory Cytokine Levels in ICR Mice

Table 3

Statistical analysis of comparison among groups in the average number of tumors per mouse (group I: control; group II: acetone; group III: DMBA; group IV: DMBA+TPA; group V: DMBA+TPA+850 nm LED; KW¹⁾: Kruskal-Wallis statistic) (there was no statistical significance from 1 week to 12 weeks).

Week	value	KW^1)	Dunn’s multiple comparison test	Dunn’s multiple comparison test
			Group I vs. group IV	Group I vs. group V
13	0.0032	15.86	#	ns
14	0.0007	19.16	#	ns
15	0.0003	21.13	ns	†
16	<0.0001	25.52	##	†
17	<0.0001	25.56	##	†
18	<0.0001	28.75	###	ns
19	<0.0001	36.96	###	††
20	<0.0001	42.94	####	††