Fig. 4.
Log shunt (left panel) and log low (right panel) during anesthesia plotted against age including both a linear and a quadratic function. Note the clear quadratic relations on log shunt but not on log low , where the quadratic and linear relations almost coincide. Equations for log shunt: Linear function, y = 0.0087x + 0.667, r2 = 0.082, P = 0.010; quadratic function, y = − 0.0006x2 + 0.0069x + 0.761, r2 = 0.166, P = 0.001; where x = age in years and y = log shunt in percent of cardiac output. Equations for log low : Linear function, y = 0.0152x + 0.604; r2 = 0.202, P < 0.001; quadratic function, y = 0.0001x2 + 0.016x + 0.584; r2 = 0.205, P < 0.001; where x = age in years and y = log low in percent of cardiac output.