TABLE 2.

Effect of age on exercise cardiopulmonary haemodynamic parameters and ULN for mPAP/CO slope and PAWP/CO slope in healthy subjects in the supine position

Slope	Age (years)	Groups included (n)	Predicted value# (WU)	sd (WU)	ULN (WU)
mPAP/CO slope	29	8	0.8 (0.5–1.27)	0.4	1.6
	39	8	1.2 (1.0–1.5)	0.3	1.7
	49	8	1.6 (1.4–1.8)	0.2	2.1
	59	8	2.0 (1.7–2.3)	0.3	2.7
	69	8	2.4 (2.0–2.8)	0.5	3.3
PAWP/CO slope	29	6	0.3 (0.1–0.4)	0.2	0.6
	39	6	0.6 (0.4–0.7)	0.1	0.8
	49	6	0.8 (0.7–1.0)	0.1	1.0
	59	6	1.1 (1.0–1.3)	0.1	1.4
	69	6	1.4 (1.2–1.7)	0.2	1.8

ULN: upper limit of normal; mPAP: mean pulmonary arterial pressure; CO: cardiac output; PAWP: pulmonary arterial wedge pressure. ^#: mean (95% confidence interval).