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Table 4 Overview of all attacks treated in 70 patients

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

  7 L/min 12 L/min Odds ratio (95% confidence interval) P-value
Patients 64 62   
Total number of attacks treated 344 366   
Attacks excludeda 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) 0.717c
Drop in VAS score (Mean – SD) 4.23 SD 2.06 4.28 SD 1.75   0.734d
Painfree after treatmentb 109 (36.2%) 93 (29.2%) 0.73 (0.52–1.02) 0.061c
Drop on 5-point scale (Mean – SD)b 1.61 SD 0.77 1.63 SD 0.66   0.683d
  1. aAttacks were excluded because of occurrence within 3 h of previous oxygen treatment or within 12 h of other attack treatment
  2. bNo data available of 6 attacks treated with both 7 L/min and 12 L/min
  3. cChi square test
  4. dIndependent samples T-test