Effects of endogenous inflammation signals elicited by nerve growth factor, interferon-γ, and interleukin-4 on peripheral nerve regeneration

Table 1 Success rates of regenerated nerves across the 15 mm gaps

Groups	Biological agent included in the silicone rubber tube
Groups	PBS	NGF^a	IL-4^b	IFN-γ
Success rate (total numbers)	4 (10)	10 (10)	8 (10)	3 (10)
p value^c	-	0.0054	0.0849	0.8251

^aNo myelinated axons were seen in three rats though their nerve gaps had been reconnected
^bNo myelinated axons were seen in one rat though its nerve gap had been reconnected
^cAll p values were estimated by Fisher’s exact test and compared to the PBS group