Association between preoperative hemoglobin and postoperative moderate and severe anemia among patients undergoing primary total knee arthroplasty: a single-center retrospective study

Table 4 LOS, expenses and complications

Variables	Non-DMSA group, N = 222	DMSA group, N = 252	p
LOS	3.06 ± 0.92	3.92 ± 0.94	0.002*
Hospitalization expenses ∆	57,143.1 ± 9246.5	59,532.3 ± 9618.2	0.031*
Transfusion	0	2 (0.8%)	0.501
Death	0	0	–
DVT	2 (0.9%)	1(0.4%)	0.602
PE	0	0	–
Nausea and vomiting	17 (7.7%)	29 (11.5%)	0.158
Cardiac infarction	1 (0.5%)	0	0.468
Stroke	0	0	–
Acute renal failure	0	0	–
Wound complications	23 (10.4%)	29 (11.5%)	0.690
Readmission	2 (0.9%)	2 (0.8%)	1.000

Wound complications included exudation, bleeding, swelling, infection and impaired wound healing
LOS, length of stay; DVT, deep venous thrombosis; PE, pulmonary embolism
p value calculated using independent t-test, Pearson's chi-squared test or Fisher's exact test
∆ Results were presented as Chinese yuan
^*Significant difference

ISSN: 1749-799X