Table 3.

Mean visual analog scores (VAS) pretreatment and postblockade

Group: duration to blockade initiation	VAS score
	Before blockade	After blockade	P value
1 Mean duration 17.0 ± 6.3 (range 6–28 weeks)	7.7 ± 1.1 (range 6–10)	0.9 ± 0.7 (range 0–2)	0.001
2 Mean duration 49.8 ± 17.6 (range 29–77 weeks)	7.9 ± 1.1 (range 7–10)	2.1 ± 1.3 (range 0–4)	0.012
Overall Mean duration 28.9 ± 19.7 (range 6–77 weeks)	7.8 ± 1.1 (range 6–10)	1.3 ± 1.1 (range 0–4)	0.000

Group 1: with a latency from symptom onset stellate ganglion blockade initiation shorter than mean latency. Group 2: with a latency from symptom onset and stellate ganglion blockade initiation longer than mean latency