Oxygen treatment for cluster headache attacks at different flow rates: a double-blind, randomized, crossover study

Table 4 Overview of all attacks treated in 70 patients

	7 L/min	12 L/min	Odds ratio (95% confidence interval)	P-value
Patients	64	62
Total number of attacks treated	344	366
Attacks excluded^a	37 (10.8%)	41 (11.2%)
Attacks included in analysis	307	325
Attacks / patient (range)	4.80 (1–19)	5.24 (1–17)
Successfully treated	211 (68.7%)	219 (67.4%)	0.94 (0.67–1.31)	0.717^c
Drop in VAS score (Mean – SD)	4.23 SD 2.06	4.28 SD 1.75		0.734^d
Painfree after treatment^b	109 (36.2%)	93 (29.2%)	0.73 (0.52–1.02)	0.061^c
Drop on 5-point scale (Mean – SD)^b	1.61 SD 0.77	1.63 SD 0.66		0.683^d

^aAttacks were excluded because of occurrence within 3 h of previous oxygen treatment or within 12 h of other attack treatment
^bNo data available of 6 attacks treated with both 7 L/min and 12 L/min
^cChi square test
^dIndependent samples T-test

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