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Table 4 Performance characteristics of intermittent auscultation augmented with the fetal scalp stimulation test

From: Using fetal scalp stimulation with Doppler ultrasonography to enhance intermittent auscultation in low-resource settings: a diagnostic trial from Tanzania

 

pH < 7.2

pH < 7.1

pH < 7.0

IAa

IA + FSSTb

p-value

IA

IA + FSST

p-value

IA

IA + FSST

p-value

Prevalence

20%

15%

0.070

13%

11%

0.597

6%

4%

0.237

Sensitivity (95% CI)

22% (11–35%)

31% (17–48%)

0.321

13% (4–30%)

34% (18–54%)

0.048

27% (8–55%)

70% (35–93%)

0.032

Specificity (95% CI)

89% (83–93%)

90% (86–94%)

0.533

86% (81–91%)

90% (85–93%)

0.239

87% (82–91%)

89% (85–93%)

0.444

PPV (95% CI)

32% (17–51%)

35% (20–54%)

0.798

12% (3–27%)

29% (15–47%)

0.072

12% (3–27%)

21% (9–38%)

0.323

NPV (95% CI)

82% (76–86%)

88% (84–92%)

0.042

88% (82–92%)

92% (88–95%)

0.134

95% (91–97%)

99% (96–100%)

0.021

  1. aIA, intermittent auscultation bIA + FSST, IA augmented with fetal scalp stimulation test