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Table 2 Comparison of mean scores of NIPS, SPO2, and heart rate before, during and after heel lance in the intervention and the control groups

From: The effect of the simulated intrauterine sound on behavioral and physiological indices of pain during capillary blood sampling for screening preterm infants: a randomized clinical trial study

Variables

Time

Intervention group

(95%)

Confidence Interval

Control group

(95%)

Confidence Interval

F

t

df

P*

Mean ± SD

Lower

Upper

Mean ± SD

Lower

Upper

NIPS

Before heel lance

0.00 ± 0.00

0.00

0.00

0.00 ± 0.00

0.00

0.00

-

-

78

0.001

During heel lance

3.55 ± 0.84

3.30

3.80

5.57 ± 0.95

5.30

5.85

0382

-10.230

78

0.001

After heel lance

1.15 ± 0.84

0.95

1.35

3.00 ± 0.98

2.70

3.30

5.004

-9.844

78

0.001

SPO2

(%)

Before heel lance

96.72 ± 0.93

96.42

97.00

96.60 ± 0.84

96.35

96.85

0.566

5.629

78

0.53

During heel lance

91.47 ± 1.46

91.05

91.92

91.50 ± 1.24

91.12

91.87

0.916

-0.082

78

0.93

After heel lance

93.60 ± 1.27

93.22

94.00

94.17 ± 1.03

93.85

94.50

2.441

-2.212

78

0.03

Heart rate

(min)

Before heel lance

127.57 ± 4.45

126.27

128.99

128.67 ± 4.57

127.32

130.07

0.033

-1.089

78

0.27

During heel lance

131.07 ± 6.54

129.20

133.22

136.07 ± 7.24

133.90

138.37

0.501

-3.240

78

0.002

After heel lance

128.45 ± 5.15

127.02

130.07

132.42 ± 6.47

130.37

134.49

2.732

-3.036

78

0.003

  1. * Independent t-test