Table 1.

The potential clinical implications of the iuMR errors made by the central and non-central reporters as judged by a Foetal Medicine expert. Implication A means ‘The disagreement in diagnoses was not likely to have changed discussions about prognosis’, implication B – ‘The disagreement in diagnoses was likely to have changed discussions about prognosis, but not about TOP’ and implication C – ‘The disagreement in diagnoses was likely to have changed discussions concerning TOP’. The confidence of the incorrect diagnoses is also shown (High = 70% or 90% certainty, Low = 10%, 30% or 50% certainty)

	N (%)	Potential clinical relevance			Confidence level of diagnosis
		A	B	C	High	Low
Central	12/316 (3·8%)	8	2	2	11	1
Non-central	28/254 (11·0%)	10	13	5	20	8