Table 2.

Resting Doppler-derived hemodynamics according to age.

Age (years)	<40 (n=38)	40–49 (n=93)	50–59 (n=127)	60–69 (n=127)	>70 (n=84)
Before exercise
Tricuspid regurgitant peak velocity (m/s*)	2.3±0.2	2.4±0.2	2.4±0.3	2.4±0.2	2.5±0.3
	(2.2, 2.3)	(2.3, 2.4)	(2.3, 2.4)	(2.4, 2.5)	(2.5, 2.6)
Pulmonary artery systolic pressure (mmHg*, **)	25±5	28±4	28±5	29±5	30±5
	(24–26)	(27–28)	(27–29)	(28–30)	(29–31)
	33	35	37	39	41
Cardiac output (L/min)	7.9±3.1	7.7±2.4	7.2±2.5	7.1±2.4	6.8±2.0
	(6.7, 9.0)	(7.1, 8.2)	(6.8, 7.7)	(6.6, 7.6)	(6.4, 7.3)
PASP/Cardiac output (mmHg/L min−1)	3.8±1.7	4.0±1.5	4.2±1.4	4.5±1.8	4.8±1.3
	(3.2, 4.5)	(3.6, 4.4)	(3.9, 4.5)	(4.2, 5.2)	(4.5, 5.2)

^*Data presented as mean±s.d. and (upper and lower 95% confidence intervals)

^**Upper normal defined as the 5% limit derived from semiparametric logistic regression of normative data factoring in age.