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Table 3 Results primary and secondary endpoints

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

  Included (N) Results (Median+IQRa) P-value
% Painfree after treatment (first 2 days) 5 7 L/min: 0 (0–37.50) 0.180b
12 L/min: 0 (0–83.50)
Drop in VAS score 56 7 L/min: 4.09 (2.67–5.48) 0.243b
12 L/min: 4.33 (2.71–5.41)
% Successfully treated attacks 56 7 L/min: 92.86 (45.10–100) 0.505b
12 L/min: 84.52 (33.33–100)
Patients preference (0–10) 46 3.50 (0.50–5.50) 0.005c
 0 favouring 12 L/min
 10 favouring 7 L/min
Patients preference 49 7 L/min: N = 11 0.059d
 7 L/min - 12 L/min - equal 12 L/min: N = 24
Equal: N = 14
% Painfree after treatment (all attack periods) 55 7 L/min: 28.57 (0–66.67) 0.039b
12 L/min: 0 (0–50.00)
Drop on 5-point scale 55 7 L/min: 1.50 (1–2) 0.475b
12 L/min 1.50 (1–2)
  1. aMedian + interquartile range (25–75)
  2. bWilcoxon Signed Ranks Test
  3. cOne sample Wilcoxon Signed Rank Test
  4. dChi square test