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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