Calculate the value of R2 given the ANOVA portion of the following regression output: 
Definitions:
Serum Sodium Concentration
The amount of sodium present in the serum portion of the blood, important for determining electrolyte balance and fluid status.
Postural Hypotension
A drop in blood pressure upon standing up from a sitting or lying position, which can cause dizziness or fainting.
Ankle Edema
Swelling in the ankles usually due to fluid accumulation, often indicative of underlying health conditions.
Magnesium
A chemical element with the symbol Mg, essential for human body functioning, participating in over 300 biochemical reactions.
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