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Table 1 Baseline of patients with moderate and severe anemia after primary TKA

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

Baseline characteristic

Non-DMSA group, N = 222

DMSA group, N = 252

p

Demographic characteristics

   

Age(\(\overline{X }\)±S)

66.8 ± 7.8

66.2 ± 7.9

0.484

Female (N, %)

154 (69.4%)

236 (93.7%)

< 0.001*

BMI(\(\overline{X }\)±S, kg/m2)

26.4 ± 3.5

25.4 ± 3.7

0.003*

Diagnosis (RA/OA)

1/221

12/240

0.004*

Preoperative knee ROM (°)

99.0 ± 17.2

100.0 ± 15.1

0.480

Preoperative HSS

49.9 ± 8.3

48.9 ± 8.4

0.275

Comorbidities (N, %)

   

Hypertension

113 (50.9%)

138 (54.8%)

0.401

Diabetes

31 (14.0%)

41 (16.3%)

0.485

Coronary heart disease

15 (6.8%)

16 (6.3%)

0.858

Preoperative anemia

6 (6.8%)

46 (18.3%)

< 0.001*

Preoperative laboratories

   

HB (g/L)

140.2 ± 11.0

125.1 ± 10.2

< 0.001*

Hct

42.0 ± 3.1

38.3 ± 3.1

< 0.001*

ESR (mm/h)

21.3 ± 20.2

22.4 ± 17.8

0.116

CRP (mg/L)

3.50 ± 2.77

3.77 ± 3.67

0.372

IL-6 (mg/L)

3.8 ± 2.4

4.3 ± 4.2

0.126

Operative variables

   

ASA class (N, %)

  

0.959

1–2

174 (78.4%)

198 (78.6%)

 

 ≥ 3

48 (21.6%)

54 (21.4%)

 

Drainage use (N, %)

42 (18.9%)

66 (26.2%)

0.060

TXA use (N, %)

217 (97.7%)

226 (89.7%)

< 0.001*

Operative time (min)

76.4 ± 12.1

77.7 ± 15.5

0.340

Intraoperative blood loss (mL)

110.0 ± 22.8

130.9 ± 34.7

< 0.001*

  1. BMI, body mass index; RA, rheumatoid arthritis; OA, osteoarthritis; ROM, range of motion; HSS, hospital for special surgery knee score; HB, hemoglobin; Hct, hematocrit; ESR, erythrocyte sedimentation rate; CRP, C reaction protein; IL-6, interleukin-6; ASA, American Society of Anesthesiologists; TXA, Tranexamic acid
  2. p value calculated using independent t-test, Pearson's chi-squared test or Fisher's exact test
  3. *Significant difference