Table 1.

Patient and tumor characteristics according to number of blood transfusions

	no transfusion	1-2 transfusions	> 3 transfusions	p
	n = 451 (77.4 %)	n = 83 (14.2 %)	n = 49 (8.4 %)
Age				0.015
≤ 66 years	236 (52.3 %)	43 (51.8 %)	15 (30.6 %)
> 66 years	215 (47.7 %)	40 (48.2 %)	34 (69.4 %)
Gender				0.269
Female	159 (35.3 %)	37 (44.6 %)	18 (36.7 %)
Male	292 (64.7 %)	46 (55.4 %)	31 (63.3 %)
BMI				0.122
< 30	326 (72.3 %)	68 (81.9 %)	39 (79.6 %)
≥ 30	125 (27.7 %)	15 (18.1 %)	10 (20.4 %)
ASA				0.058
I	51 (11.3 %)	8 (9.6 %)	3 (6.1 %)
II	229 (50.8 %)	35 (42.2 %)	16 (32.7 %)
III	156 (34.6 %)	36 (43.4 %)	28 (57.1 %)
IV	15 (3.3 %)	4 (4.8 %)	2(4.1 %)
Tumor localization				0.263
colon	275 (61.0 %)	44 (53.0 %)	26 (53.1 %)
rectum	176 (39.0 %)	39 (47.0 %)	23 (46.9 %)
pT stage				0.138
T1	47 (10.4 %)	4 (4.8 %)	3 (6.1 %)
T2	79 (17.5 %)	18 (21.7 %)	4 (8.2 %)
T3	267 (59.2 %)	45 (54.2 %)	34 (69.4 %)
T4	58 (12.9 %)	16 (19.3 %)	8 (16.3 %)
pN stage				0.658
N0	268 (59.4 %)	53 (63.9 %)	25 (51.0 %)
N1	125 (27.7 %)	22 (26.5 %)	17 (34.7 %)
N2	58 (12.9 %)	8 (9.6 %)	7 (14.3 %)
Tumor differentiation				0.361
well	148 (32.8 %)	24 (28.9 %)	16 (32.6 %)
moderately	262 (58.1 %)	47 (56.6 %)	31 (63.3 %)
poorly	41 (9.1 %)	12 (14.5 %)	2 (4.1 %)
Surgical approach				0.715
open	176 (39.0 %)	32 (38.6 %)	22 (44.9 %)
laparoscopic	275 (61.0 %)	51 (61.4 %)	27 (55.1 %)
Duration of operation				0.020
≤ 150 min	245 (54.3 %)	32 (38.6 %)	22 (44.9 %)
> 150 min	206 (45.7 %)	51 (61.4 %)	27 (55.1 %)
Blood loss				<0.001
≤ 500 ml	418 (92.7 %)	64 (77.1 %)	30 (61.2 %)
501–1000 ml	32 (7.1 %)	13 (15.7 %)	9 (18.4 %)
> 1000 ml	1 (0.2 %)	6 (7.2 %)	10 (20.4 %)
Postoperative morbidity				<0.001
no	363 (80.5 %)	57 (68.7 %)	17 (34.7 %)
yes	88 (19.5 %)	26 (31.3 %)	32 (65.3 %)