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 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 + 0.17x. 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 + 0.17x. 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
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 + 0.17x. 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 + 0.17x. 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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Subject
Healthcare