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Table 2 Change in attack frequency (mean ± SD (range)) between baseline and 12 months post-microstimulator insertion

From: Sphenopalatine ganglion stimulation for cluster headache, results from a large, open-label European registry

Analysis All patients Chronic patients only Episodic patients only
Baseline frequency (attacks/week) 12 month frequency (attacks/week) Baseline frequency (attacks/week) 12 month frequency (attacks/week) Baseline frequency (attacks/week) 12 month frequency (attacks/week)
All patients 25.2 ± 20.3 (0–96) 14.4 ± 17.9 (0–70) 24.3 ± 18.2 (0–84) 14.9 ± 18.1 (0–70) 34.3 ± 37.7 (7–96) 9.1 ± 13.6 (0–30)
p < 0.0001, n = 85 p < 0.0001, n = 78 p = 0.1094, n = 7
Frequency responders 26.7 ± 22.4 (3–96) 3.3 ± 6.3 (0–28) 24.7 ± 19.1 (3–84) 2.9 ± 5.4 (0–25) 30.0 ± 37.8 (7–96) 10.0 ± 14.8 (0–30)
p < 0.0001, n = 48 p < 0.0001, n = 43 p = 0.0625, n = 5