Table 5.

Haematology data.

	Perceval valve N=72	Perimount Magna N=101	P
Maximum drop in platelet count: "which day"	Mean 2.3 Median 2 Range 0-5	Mean 1.7 Median 2 Range 0-6	0.0005
Maximum drop in platelet count: "what %"	Mean 58.0% Median 58.3% Range 35-84%	Mean 44.3% Median 45.0% Range 14-64%	<0.0001
Blood transfusion: units	Mean 1.5 Median 0.5 Range 0-10	Mean 0.7 Median 0 Range 0-8	0.0091
Platelet transfusion: pool of platelets	Mean 0.3 Median 0 Range 0-4	Mean 0.1 Median 0 Range 0-2	0.0075
FFP Transfusion: units	Mean 0.2 Median 0 Range 0-4	Mean 0.1 Median 0 Range 0-3	0.21