“…There were only four (7%) studies using longitudinal data 29 , 48 , 49 , 74 and only two of the studies gave an unreproducible description of their method. 67 , 76 Furthermore, 27 (49%) studies had, besides qualitative and/or quantitative reporting of outcome, additionally multiple raters or compared their result to known clinical outcomes. Regarding analysing the influence of confounders, 19 (35%) studies did not adjust or analyse the influence of at least one of the key confounders (GA, acquisition quality or body mass index) and only four (7%) studies performed an analysis to identify or adjust for additional confounders such as, challenging fetal position, abdominal scarring and uterine fibroid, 67 fetal position, maternal body habitus and prior uterine surgery, 27 maternal age, pregnancy duration, birthweight, number of ultrasound examinations, 49 maternal age and fetal position.…”