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Objectives: Computer CTG analysis (cCTG) included short-term variation (STV) is one of the methods of monitoring fetal condition during delivery. The aim of our study was to define appropriability of STV measured within 1 hour before delivery in prediction of neonatal outcomes. Material and methods:The retrospective study included 1014 pregnant women, who gave birth in the Department of Obstetrics and Perinatology. Participants were divided into two groups: group 1term pregnancies (37-41 weeks) and group 2preterm pregnancies (lower than 37 weeks). In each of them, two subgroups have been separated: control (STV ≥ 3 ms) and study group (STV < 3 ms).Results: In both groups 1 and 2, there were no statistically significant differences related to Apgar scores in 1 st , 3 rd and 5 th minute between group with STV < 3 ms and group with STV > 3 ms Moreover, for 37-41 weeks the sensitivity, specificity, positive predictive value and negative predictive value were: 22.7%, 83.9%, 3.3% and 97.8% and for lower than 37: 45.7%, 65.4%, 47.1%, 64.2% in 1 th minute after delivery. In group 1 the area under curve (AUC) measurements were 0.45 (95% CI: 0.32-0.58) for 1 st minute and 0.55 (95% CI: 0.35-0.74) for 5 th minute and in group 2: 0.58 (95% CI: 0.45-0.71) for 1th minute and 0.57 (95% CI: 0.42-0.72) for 5 th minute.Conclusions: High specificity and negative predictive value of STV indicates a good Apgar score of newborns in term pregnancies. Analysis of STV in preterm pregnancy is not clear.Fetal well-being in preterm pregnancy should include STV and other non-invasive and invasive tools.

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