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Table 5 Difference in lowest SpO2 levels between the two groups

From: Apnoeic oxygenation by nasal cannula during airway management in children undergoing general anaesthesia: a pilot randomised controlled trial

SpO2% Count (Percentage) Chi-square P-value
Control group Intervention group
SpO2 73% 1 (6.7%) 0 (0%) 16.462 p = 0.002 a,b
SpO2 96% 2 (13.3%) 0 (0%)
SpO2 98% 4 (26.7%) 0 (0%)
SpO2 99% 2 (13.3%) 0 (0%)
SpO2 100% 6 (40%) 15 (100%)
Total 15 (100%) 15 (100%)
  1. SpO2% = Percentage of Oxygen Saturation, N = Number of patients
  2. aLikelihood ratio is used instead of Pearson Chi-Square when an assumption is violated and the table is bigger than 2*2
  3. bP-value < 0.05 which indicates a significant difference between the groups