Figure 3From: Pituitary-adrenal function in patients with acute subarachnoid haemorrhage: a prospective cohort studyPooled data and quadratic regression analysis. Equation from quadratic regression analysis for serum free cortisol concentration = 0.024 × serum total cortisol concentration + 0.0000772 × total cortisol concentration2. Pearson correlation coefficient 0.88, p < 0.001.Back to article page