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

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

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

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