Table 2

Comparison of yields and costs of strategy A (examination of a single section) with strategy C (levels cut if initial section shows PALI)

	Yields			Costs*
Diagnostic category	Strategy A	Strategy C	Marginal yield	Strategy A	Strategy C	Marginal cost
*In Welcan units.
Normal	132	132		396	396
PALI	14	12		42	72
GCA	21	23	2	63	75
Total	167	167		501	543	42