Inter‐observer agreement in clinical decision‐making for abnormal cardiotocogram (CTG) during labour: a comparison between CTG and CTG plus STAN

Objective To compare inter‐observer agreement for clinical decision‐making with cardiotocography (CTG) and combined CTG with ST‐segment analysis (STAN). Design Experimental study. Setting Three hospital obstetrics departments in France. Population Thirty randomly selected nonreassuring CTG recordings during labour of women with singleton term pregnancies in cephalic position. Methods Seven obstetricians independently assessed the tracings, displayed in a random order on their computers, on two separate sessions, the first without and the second with STAN information. The observers received clinical information about the labour as the tracings continued and were asked whether they would intervene. For analysis, we considered that intervention was justified for the neonates with pH 7.10 after spontaneous delivery. Main outcome measures Kappa values and rates of inter‐observer agreement for intervention and for nonintervention. Results Kappa for inter‐observer agreement was 0.50 (0.29–0.69) with CTG, and 0.67 (0.48–0.81) with CTG + STAN. The rate of inter‐observer agreement for the decision to intervene was 73% (68–77%) with CTG and 70% (66–75%) with CTG + STAN (P = 0.4), and for the nonintervention decision it was 48% (42–54%) and 69% (64–74%), respectively (P