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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