An apgar score between 0 and 3 is considered a low apgar score, between 4 and 6
ID: 3295415 • Letter: A
Question
An apgar score between 0 and 3 is considered a low apgar score, between 4 and 6 a medium apgar score, and between 7 and 9 a high apgar score. Please see output below:
Analysis of Variance
Source
DF
Sum of
Squares
Mean
Square
F Value
Pr > F
Model
4
72.96826
18.24206
3.08
0.0197
Error
95
562.82174
5.92444
Corrected Total
99
635.79000
Parameter Estimates
Variable
Label
DF
Parameter
Estimate
Standard
Error
t Value
Pr > |t|
Intercept
Intercept
1
26.03389
1.17041
22.24
<.0001
sbp
sbp
1
0.05502
0.02188
2.51
0.0136
male
1
-0.09505
0.49241
-0.19
0.8473
apgarMED
1
-0.40984
0.80757
-0.51
0.6130
apgarHIG
1
0.69045
0.73130
0.94
0.3475
1. Does apgar score, when treated categorically, significantly predict gestational age, given that systolic blood pressure and gender are already in the model? Use partial F test to show.
2. Interpret the coefficients for apgarMED and apgarHIG.
3. Suppose researchers want to test if the relationship between gestational age and systolic blood pressure depends on apgar score. What could they do to address this question?
Analysis of Variance
Source
DF
Sum of
Squares
Mean
Square
F Value
Pr > F
Model
4
72.96826
18.24206
3.08
0.0197
Error
95
562.82174
5.92444
Corrected Total
99
635.79000
Explanation / Answer
1. Yes when apgar score is treated categorically, significantly can not predict gestational age, given that systolic blood pressure and gender are already in the model. In ANOVA table Pr>F is less than 0.05 So we can conclude that.
2. apgarMED and apgarHIG, coefficients of both are not significant. Because P-values for both are high.
3. covariance matrix can be used.