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Table 1 Clinical characteristics of the study population categorized by total hip T-score

From: The association between bone mineral density and postoperative drainage volume following cruciate-substituting primary total knee arthroplasty: a cross-sectional study

Clinical characteristics

Normal BMD

(n = 69)

Low BMD

(n = 50)

P value

Age (years)

72.64 ± 5.95

73.90 ± 5.67

0.247

Sex

 Female

62 (89.9%)

48 (96.0%)

0.211

 Male

7 (10.1%)

2 (4.0%)

 

BMI (kg/m2)

27.77 ± 4.19

25.50 ± 3.64

0.002

Anesthesia

 Spinal anesthesia

20 (29.0%)

16 (32.0%)

0.724

 General anesthesia

49 (71.0%)

34 (68.0%)

 

ASA score

 2

28 (40.6%)

14 (28.0%)

0.156

 3

41 (59.4%)

36 (72.0%)

 

Hypertension

 Yes

54 (78.3%)

43 (86.0%)

0.283

 No

15 (21.7%)

7 (14.0%)

 

Prior antiplatelet treatment

 Yes

8 (11.6%)

7 (14.0%)

0.696

 No

61 (88.4%)

43 (86.0%)

 

Operative time (min)

103.67 ± 8.29

96.70 ± 8.93

< 0.001

Patella resurfacing

 Yes

59 (85.5%)

36 (72.0%)

0.07

 No

10 (14.5%)

14 (28.0%)

 

Blood transfusion

 Yes

2 (2.9%)

1 (2.0%)

0.758

 No

67 (97.1%)

49 (98.0%)

 

Postoperative MAP (mmHg)

96.70 ± 9.40

95.40 ± 10.71

0.485

Laboratory parameters

 Hemoglobin (g/mm3)

12.1 ± 1.2

12.2 ± 1.2

0.787

 Hematocrit (%)

37.3 ± 3.7

37.4 ± 3.3

0.884

 Platelet (× 103/mm3)

261.2 ± 70.3

246.4 ± 52.0

0.213

  1. Variables are presented as mean ± SD or number (count)
  2. BMD bone mineral density, BMI body mass index, ASA American Society of Anesthesiologists, MAP mean arterial pressure