Figure 2
Cardiac index in healthy subjects declined with age similarily in males (open squares) and females (filled circles). The linear regression lines are shown in solid lines and the 95% confidence interval with broken lines. The relationship between CI and age was similar in males (y = −0.0095age + 3.275, r2 = 0.08, p = 0.02) and females (y = −0.0072age + 3.423, r2 = 0.08, p = 0.02).