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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.

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    Analysis of Blood Pressure Trends in Neonates Based on Weight and Postnatal Age 1. What are the independent and dependent variables in Figures 2, A, B, and C ? How would you describe the relationship between the variables in Figures 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 blood pressure and mean blood pressure. There is a positive correlation between independent variable and dependent variable in Figure 2. 2. What are the independent and dependent variables in Figures 3, A, B, and C ? How would you describe the relationship between the variables in Figures 3, A, B, and C ? The independent variable is neonate with weight between 1001 and 1500 grams. The dependent variables are systolic blood pressure, diastolic blood pressure and mean blood pressure. There is a positive correlation between independent variable and dependent variable in Figure 3. 3. Was there a significant difference in the y intercept for the lines of best fit in Figure 2 from the y intercept for the lines of best fit in Figure 3 ? Provide a rationale for your answer. There was a significant difference in the y intercept for the lines of best fit in Figure 2 from the y intercept for the lines of best fit in Figures 3 since the test probability P is less than 0.001. 4. Ŷ represents the predicted value of y calculated using the equation Ŷ = a + bx . In Figure 2 , the formula for SBP is Ŷ = 43.2 + 0.17 x . Identify the y intercept and the slope in this formula. What does x represent in this formula? Y intercept is 43.2 and the slope is 0.17. x represents postnatal age in the unit of hours. 5. In the legend beneath Figure 2 , the authors give an equation indicating that systolic blood pressure is SBP = 43.2 + 0.17 x . If the value of x is postnatal age of 30 hours, what is the value for Ŷ or SBP for neonates ≤1,000 grams? Show your calculations. When x=30, SBP=43.2+0.17*30=48.3

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