Table III.

Daily RBC regeneration rate in response to PABD of one or two units with respect to time-intervals.

One PABD (n = 439)				Two PABD (n = 265)
Time interval		RBC generation (mL/day)	P value Within 1 PABD	Time interval		RBC generation (mL/day)	P value within 2 PABD	P value between 1and 2 PABD
(weeks)	(days)			(weeks)	(days)
T1 – S	21.8 ± 9.5	5.2 ± 4.3a, b		T1 – S	35.8 ± 8.8			<0.000
T1 – 2						7.2 ± 3.0		<0.001
				T1 – T2	16.3 ± 6.0		<0.001
				T2 – S	19.5 ± 7.3
				T1 – T2		5.6 ± 5.8a	<0.001	ns
				T2 – S		8.7 ± 5.7b		<0.001
T1 – S (<3 weeks)	18.7 ± 2.2			T2 – Sc (<2 weeks)	11.3 ± 3.1		<0.001
T1 – S (>4 weeks)	36.6 ± 6.7		<0.001	T2 – Sd (>4 weeks)	33.0 ± 4.5
		5.8 ± 3.7		T2 – S (<2 weeks)		9.8 ± 8.4	<0.05
		4.2 ± 3.4	<0.001	T2 – S (>4 weeks)		7.0 ± 2.3

PABD=pre-operative autologous blood donation; T1 – S=time-interval between first PABD and surgery; T1 – T2=time interval between first and second PABD; T2 – S=time interval between second PABD and surgery; ns=not statistically significant. Data are given as mean ± SD;

^{c, d:}corresponding time-interval ‘T1 – T2’:

^b17.7 ± 6.9 versus

^c15.1 ± 5.8 days; P=ns. Data drawn from Singbartl et al. (2007)²¹.