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

Table 2

Baseline characteristics.

Characteristic	Overall
	Total	Mean or	SD or %
Age at injection (years)	31	53.4	8.5
Number of levels	31	2.1	0.8
Female sex	31	19	61
Multiple levels injected	31	17	55
Levels injected
L1-L2	31	0	0
L2-L3	31	3	10
L3-L4	31	8	26
L4-L5	31	25	81
L5-S1	31	17	55
Baseline PROMs
Current NRS pain	31	5.6	1.6
Best NRS pain	31	4.1	1.9
Worst NRS pain	31	6.9	1.4
FRI score	31	52.5	12.1
SF-36 pain score	31	45.0	13.1
SF-36 physical function score	31	51.8	13.1

FRI: functional rating index; NRS: numerical rating scale; PROM: patient-reported outcome measure; SD: standard deviation; SF-36: 36-item short form.