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Table 2 Descriptive statistics for capnographic wave parameters by exposure within open and sealed HEF and the paired t-test for EtCO2 wave parameters

From: A novel application of capnography during controlled human exposure to air pollution

EtCO2 Wave Parameters EXP Paired t-test (exp1-exp2)
  1 2   
  N Mean Std CV N Mean Std CV t p
Total length 60 3.53 0.63 17.9 54 3.39 0.69 20.32 0.62 0.58
Total area under the curve 60 84.62 16.85 19.92 54 78.68 16.89 21.46 0.85 0.46
phase II length 60 0.76 0.19 24.44 54 0.73 0.2 27.58 -0.02 0.98
phase II slope 60 44.46 10.19 22.92 54 45.41 10.38 22.86 0.49 0.66
phase II absolute difference 60 31.97 2.07 6.48 54 31.28 2.04 6.52 1.03 0.38
phase III length 60 1.63 0.39 24.02 54 1.52 0.41 26.96 0.81 0.48
phase III slope 60 3.15 1.66 52.57 54 3.49 2.02 57.96 -1.33 0.28
phase III area under the curve 60 59.40 13.44 22.63 54 54.86 14.36 26.18 0.64 0.57
phase III absolute difference 60 4.58 1.61 35.23 54 4.26 1.63 38.16 1.85 0.16
EtCO2 (signal maximum) 60 37.12 1.54 4.14 54 36.53 1.63 4.48 0.95 0.41
Zero-corrected EtCO2 60 36.84 1.43 3.89 54 35.83 1.3 3.62 1.29 0.29