Dependent Variable: incidence of hypotension
Figure 1: The scatterplot of hypotension in the standardized expected value and the standardized residuals
Variables
mean
std
# Incidence of hypotension
2.39
2.032
Volume management
1.50
0.501
LA used in SA
1.50
0.501
Management of vasoconstrictor (phenylephrine)
2.00
0.818
Weight(kg)
68.14
7.806
Age (y)
29.99
4.448
Height (cm)
158.86
4.836
Body mass index (kg/m2)
26.9841
2.63540
Continuous dose of phenylephrine(µg/kg/min)
.0917
0.13071
Total dosage of phenylephrine (µg/kg)
5.1688
3.40558
Total dosage of romethamine (µg/kg)
7.5
50.75
Liquid volume before anesthesia (ml/kg)
9.0053
4.89365
Liquid volume after anesthesia (ml/kg)
9.5581
2.96324
Total liquid volume ml/kg)
18.5634
4.52827
Blood loss (ml/kg)
3.1595
0.48317
Intraoperative epidural dosage (ml)
4.11
3.058
Block level of touch as the pain block level at T6
11.80
2.146
Block level of pressure as pain block level at T6
14.43
1.208
Time of operation(min)
42.51
7.672

#:the dependent variable
Table 1: Dependent variables and independent variables (n=240)

Mode l
R
R Square
Adjusted R Square
Std. Error of the Estimate
P
1
.536a
.287
.284
1.719
0.000
2
.942b
.887
.886
.687
0.244
3
.955c
.912
.911
.606
0.184
4
.957d
.916
.914
.594
0.201
5
.958e
.917
.916
.591
0.408
a. Predictors: (Constant), continuous dose of phenylephrine
b. Predictors: (Constant), continuous dose of phenylephrine, total dosage of phenylephrine
c. Predictors: (Constant), continuous dose of phenylephrine, total dosage of phenylephrine, management of vasoconstrictor
d. Predictors: (Constant), continuous dose of phenylephrine, total dosage of phenylephrine, management of vasoconstrictor, LA used in SA
e. Predictors: (Constant), continuous dose of phenylephrine, total dosage of phenylephrine, management of vasoconstrictor, LA used in SA, time of operation

Table 2: Incidence of hypotension

Mode l
Dimension
Eigenvalue
Condition Index
Variance Proportions
(Constant)
Continuous dose of phenylephrine
Total dosage of phenylephrine
Management of Vasoconstrictor
LA used in SA
Time of operation
1
1
1.575
1.000
.21
.21
2
.425
1.925
.79
.79
2
1
2.540
1.000
.02
.01
.01
2
.427
2.439
.22
.13
.00
3
.033
8.711
.76
.86
.99
3
1
3.489
1.000
.00
.01
.00
.00
2
.447
2.793
.05
.09
.00
.00
3
.044
8.892
.00
.15
.76
.25
4
.020
13.376
.95
.75
.23
.74
4
1
4.268
1.000
.00
.00
.00
.00
.00
2
.605
2.655
.01
.07
.01
.00
.04
3
.065
8.120
.10
.07
.00
.12
.84
4
.044
9.900
.00
.21
.81
.18
.04
5
.018
15.256
.88
.65
.18
.69
.08
5
1
5.148
1.000
.00
.00
.00
.00
.00
.00
2
.690
2.732
.00
.06
.01
.00
.02
.00
3
.077
8.167
.01
.01
.00
.03
.88
.07
4
.044
10.871
.00
.19
.80
.20
.03
.00
5
.031
12.928
.00
.45
.10
.52
.00
.34
6
.011
21.329
.98
.28
.09
.25
.07
.58

Table 3: Incidence of hypotension

Model
Unstandardized Coefficients
Standardized Coefficients
t
Sig.
Collinearity Statistics
B
Std. Error
Beta
Tolerance
VIF
1
(Constant)
3.151
.136
23.234
.000
continuous dose of phenylephrine
-8.333
.851
-.536
-9.794
.000
1.000
1.000
2
(Constant)
-.125
.107
-1.169
.244
continuous dose of phenylephrine
-34.060
.802
-2.191
-42.482
.000
.180
5.568
total dosage of phenylephrine
1.090
.031
1.827
35.428
.000
.180
5.568
3
(Constant)
1.033
.169
6.121
.000
continuous dose of phenylephrine
-29.984
.861
-1.929
-34.805
.000
.121
8.263
total dosage of phenylephrine
1.095
.027
1.836
40.348
.000
.180
5.571
management of vasoconstrictor (phenylephrine)
-.779
.094
-.314
-8.286
.000
.259
3.860
4
(Constant)
1.379
.199
6.938
.000
continuous dose of phenylephrine
-30.128
.847
-1.938
-35.576
.000
.121
8.287
total dosage of phenylephrine
1.102
.027
1.846
41.224
.000
.179
5.601
management of vasoconstrictor (phenylephrine)
-.780
.092
-.314
-8.446
.000
.259
3.860
LA used in SA
-.242
.077
-.060
-3.150
.002
.995
1.005
5
(Constant)
1.808
.291
6.217
.000
continuous dose of phenylephrine
-30.015
.843
-1.931
-35.593
.000
.120
8.323
total dosage of phenylephrine
1.099
.027
1.841
41.328
.000
.178
5.617
management of vasoconstrictor (phenylephrine)
-.780
.092
-.314
-8.500
.000
.259
3.860
LA used in SA
-.241
.076
-.059
-3.148
.002
.994
1.006
time of operation
-.010
.005
-.038
-2.010
.046
.991
1.009

a. Dependent Variable:  incidence of hypotension
Table 4: Coefficients of the multiple linear regression equation

Dependent Variable
(I)continuous dose of phenylephrine
(J)continuous dose of phenylephrine
Mean Difference (I-J)
Std. Error
Sig.
95% Confidence Interval
Lower Bound
Upper Bound
pH
Group1
Group2
.017*
.005234
.041
-.021
-.001
Group3
.012*
.005234
.021
-.022
-.001
Group2
Group1
.107
.005234
.041
.001
.021
Group3
.142
.006620
.830
-.014
.011
Group3
Group1
.121
.005234
.021
.001
.022
Group2
.142
.006620
.830
-.011
.014
BE
Group1
Group2
.331
.355
.352
-1.03
.37
Group3
.469
.355
.188
-.23
1.17
Group2
Group1
.331
.355
.352
-.37
1.03
Group3
.800
.449
.076
-.09
1.69
Group3
Group1
.469
.355
.188
-1.17
.23
Group2
.800
.449
.076
-1.69
.09
APGAR1
Group1
Group2
.025
.058
.665
-.09
.14
Group3
.025
.058
.665
-.09
.14
Group2
Group1
-.025
.058
.665
-.14
.09
Group3
.000
.073
1.00
-.14
.14
Group3
Group1
-.025
.058
.665
-.14
.09
Group2
.000
.073
1.00
-.14
.14
APGAR5
Group1
Group2
-.006
.011
.586
-.03
.02
Group3
-.006
.011
.586
-.03
.02
Group2
Group1
.006
.011
.586
-.02
.03
Group3
.000
.014
1.00
-.03
.03
Group3
Group1
.006
.011
.586
-.02
.03
Group2
.000
.014
1.00
-.03
.03
* The mean difference is significant at the 0.05 level
Table 5: Multiple Comparisons