Table 3. Mean, SD, range and COV of OUE measurements during Cardiopulmonary Exercise Testing in IPAH patients (N = 32).

	OUEP (ml/L)	OUES [L/min/log(L/min)]
Mean±SD	23.4±4.9	1.1±0.4
Range	11.0-31.0	0.51-1.76
COV	20.9%***	34.3%

***P<0.0001 by paired t test, versus OUES.

COV  =  coefficient of variation (SD/mean); all other abbreviation definitions are same as Table 1.