Table 2.

Comparison of TGF-β level in disc of rats in normal, control and experimental groups at three different periods

Groups	Weeks	N	Rank mean of TGF-β	df	P
Normal	2	5	7.15	2	0.375
	4	5	8.69
	6	5	8. 69
Control	2	5	6.73	2	0.325
	4	5	8.21
	6	5	9.66
Experimental	2	5	6.83	2	0.251
	4	5	8.21
	6	5	9.66