Intradiscal Autologous Platelet-Rich Plasma Injection for Discogenic Low Back Pain: A Clinical Trial

Table 4

Effect of age, sex, and number of levels on success.

Parameter	Failure ()		Success ()		value
	Mean or	SD or %	Mean or	SD or %
Females (vs. males)	6	66%	13	59%	>0.99
Age at injection (years)	56.2	8.6	52.3	8.4	0.25
Number of levels	2.2	0.7	1.6	0.7	0.03
Multilevels injected	5	55%	2	9%	0.01

SD: standard deviation.