Table 4

Incremental cost-effectiveness ratios (ICERs)

	Increase in cost^a	Increase in number of women screened by 70 days^a	ICER (woman screened by 70 days)^b
Base case results
Primary care sequential versus midwife care	£33 000	2623	£13
Primary care parallel versus midwife care	£56 000	2292	£25
Primary care parallel versus primary care sequential	£23 000	-331	D

Results from sensitivity analysis, including both NHS and private costs
Primary care sequential versus midwife care	£40 000	2623	£15
Primary care parallel versus midwife care	£71 000	2292	£32
Primary care parallel versus primary care sequential	£32 000	-331	D

↵a Rate per 10 000 women screened.
↵b Cost per additional woman screened by 70 days. D = dominated (that is, primary care parallel is associated with both a higher cost and poorer outcomes).