Table I.

Demographic data

Grouping by GA and weight at birth	n	Mean GA (wk)	Mean body weight (g)	Mean length of stay (d)	No. of transfusions, median (range)	Mean PMA at transfusion
Transfusion cohort
≤27 wk	55	25.4	818	86	1 (1–6)	29.9
>27 wk	12	29.8	1195	64	1 (1–4)	33.4
≤1000 g	48	25.3	763	90	1(1–6)	32.3
>1000 g	19	28.1	1172	64	1(1–3)	30.2
Total	67	26.1	885	82	1 (1–6)	31.8
Grouping by GA and weight at birth	n	Mean GA (wk)	Mean body weight (g)	Mean length of stay (d)	No. of hematocrits	Mean PMA at hematocrit (wk)
Hematocrit cohort
≤27 wk	112	25.2	793	93	973	32.6
>27 wk	113	30.1	1222	44	480	32.8
≤1000 g	112	26	803	86	1098	32.8
>1000 g	113	30	1323	41	355	32.6
Total	225	27.7	1009	68	1453	32.7

GA, gestational age.