Table 5.

Longitudinal linear regression analyses of patient- and platelet-related variables affecting interval to next transfusion

Variable	Days to next transfusion*	95% confidence interval	P
Patient related
Decrease days to next transfusion
Females with at least 2 pregnancies, or males	-0.40	-0.21 to -0.59	< .001
DIC	-0.40	-0.05 to -0.75	.03
Heparin	-0.37	-0.20 to -0.56	< .001
Lymphocytotoxic antibody-positive	-0.36	-0.19 to -0.54	< .001
Bleeding	-0.33	-0.23 to -0.43	< .001
Amphotericin	-0.28	-0.20 to -0.36	< .001
Fever	-0.25	-0.18 to -0.31	< .001
Palpable spleen	-0.23	-0.05 to -0.42	.01
Infection	-0.18	-0.11 to -0.25	< .001
Transfusion sequence†	-0.02	-0.02 to -0.03	< .001
Weight‡	-0.01	0.00 to -0.01	< .001
Platelet related
Increase days to next transfusion
Platelets stored no more than 48 hours	0.19	0.12 to 0.26	< .001
Platelet dose§	0.16	0.14 to 0.19	< .001
Decrease days to next transfusion
UVB-PC	-0.21	-0.06 to -0.37	.006

^*Estimated change in days to next transfusion

^†An increase of 1 in the transfusion sequence number decreases the days to next transfusion by 0.02 days

^‡An increase of 1 kg in weight decreases the days to next transfusion by 0.01 days

^§An increase of 10¹¹ platelets transfused increases the days to next transfusion by 0.16 days