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Analysis of Blood Pressure Trends in Neonates Based on Weight and Postnatal Age

A study of how blood pressure trends in neonates are influenced by weight and postnatal age.

David Brown
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Analysis of Blood Pressure Trends in Neonates Based onWeight and Postnatal Age1.What are the independent and dependent variables inFigures 2, A, B, andC? How would you describe the relationship between the variables inFigures 2,A, B, and C?The independent variable is neonate with weight of less than 1000 grams;the dependent variables are systolic blood pressure, diastolic bloodpressure and mean blood pressure. There is a positive correlation betweenindependent variable and dependent variable in Figure 2.2.What are the independent and dependent variables inFigures 3, A, B, andC? How would you describe the relationship between the variables inFigures 3,A, B, and C?The independent variable is neonate with weight between 1001 and 1500grams. The dependent variables are systolic blood pressure, diastolicblood pressure and mean blood pressure. There is a positive correlationbetween independent variable and dependent variable in Figure 3.3.Was there a significant difference in theyintercept for the lines of best fitinFigure 2from theyintercept for the lines of best fit inFigure 3? Provide arationale for your answer.There was a significant difference in the y intercept for the lines of best fitin Figure 2 from the y intercept for the lines of best fit in Figures 3 sincethe test probability P is less than 0.001.4.Ŷrepresents the predicted value ofycalculated using the equationŶ=a+bx. InFigure 2, the formula for SBP isŶ= 43.2 + 0.17x. Identify theyinterceptand the slope in this formula. What doesxrepresent in this formula?Y intercept is 43.2 and theslope is 0.17. x represents postnatal age in theunit of hours.5.In the legend beneathFigure 2, the authors give an equation indicating thatsystolic blood pressure is SBP = 43.2 + 0.17x. If the value ofxis postnatal ageof 30 hours, what is the value forŶor SBP for neonates ≤1,000 grams? Showyour calculations.When x=30, SBP=43.2+0.17*30=48.3

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