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Table 2 Patient demographics and preoperative characteristics

From: Establishment and assessment of a nomogram for predicting blood transfusion risk in posterior lumbar spinal fusion

 

Total

Not transfused

Transfused

P value

Number of patients

885

596

289

 

Age (years)

   

0.038

 < 60

339 (38.31%)

249 (41.78%)

90 (31.14%)

 

 ≧ 60

546 (61.69%)

347 (58.22%)

199 (68.86%)

 

Gender (%)

   

0.312

 Male

440 (49.718%)

315 (52.852%)

125 (43.253%)

 

 Female

445 (50.282%)

281 (47.148%)

164 (56.747%)

 

Comorbidities

   

0.057

 None (%)

135 (15.254%)

93 (15.604%)

42 (14.533%)

 

 1–3 (%)

543 (61.356%)

352 (59.060%)

191 (66.090%)

 

 ≧ 4 (%)

207 (23.390%)

151 (25.336%)

56 (19.377%)

 

BMI (kg/m2)

28.8 [26.6, 31.0]

28.6 [26.4, 30.7]

29.6 [26.9, 32.1]

0.001

Smoker (%)

   

0.323

 Yes

256 (28.927%)

79 (13.255%)

177 (61.246%)

 

 No

629 (71.073%)

517 (86.745%)

112 (38.754%)

 

ASA class (%)

   

< 0.001

 1

57 (6.441%)

49 (8.221%)

8 (2.768%)

 

 2

504 (56.949%)

351 (58.893%)

153 (52.941%)

 

 3

316 (35.706%)

192 (32.215%)

124 (42.907%)

 

 4

8 (0.904%)

4 (0.671%)

4 (1.384%)

 

Levels of fusion (%)

   

< 0.001

 1

344 (38.870%)

301 (50.503%)

43 (14.879%)

 

 2

184 (20.791%)

146 (24.497%)

38 (13.149%)

 

 ≧ 3

357 (40.339%)

149 (25.000%)

208 (71.972%)

 

Time to surgery (days)

5.4 [4.6, 6.5]

5.1 [4.3, 5.8]

6.5 [5.4, 7.7]

< 0.001

Total intraoperative EBL (ml)

357.9 [273.3, 512.0]

320.3 [238.3, 390.7]

857.3 [422.4, 956.1]

< 0.001

Operative time (min)

191.2 [154.3, 235.9]

181.0 [150.1, 210.5]

249.4 [176.7, 344.0]

< 0.001

Previous transfusion (%)

   

0.023

 Yes

24 (2.712%)

11 (1.846%)

13 (4.498%)

 

 No

861 (97.288%)

585 (98.154%)

276 (95.502%)

 

Previous surgery (%)

   

0.211

 Yes

74 (8.362%)

45 (7.550%)

29 (10.035%)

 

 No

811 (91.638%)

551 (92.450%)

260 (89.965%)

 

Preoperative APTT

31.4 [29.9, 33.0]

31.3 [29.9, 32.9]

31.6 [29.8, 33.6]

0.091

Preoperative PT

11.9 [11.1, 12.9]

12.1 [11.2, 13.1]

11.5 [10.8, 12.4]

< 0.001

Preoperative fibrinogen

3.2 [2.7, 3.7]

3.2 [2.7, 3.7]

3.2 [2.6, 3.7]

0.630

Preoperative platelet count

249.9 [211.3, 297.5]

248.3 [209.3, 298.9]

253.7 [214.8, 293.6]

0.861

Preoperative hematocrit

35.5 [32.9, 37.8]

36.4 [34.1, 38.6]

33.2 [31.0, 35.9]

< 0.001

Preoperative Hb

113.3 [106.2, 121.7]

115.5 [107.9, 126.2]

109.9 [104.2, 114.8]

< 0.001

Preoperative WBC

7.21 [5.6, 8.7]

7.2 [5.5, 8.6]

7.3 [5.7, 8.7]

0.733

LOS

9.12[5.6, 8.7]

7.13[4.90, 9.36]

11.77[6.93, 15.61]

< 0.001

  1. BMI Body mass index, ASA American Stroke Association, EBL Estimated blood loss, APTT Activated partial thromboplastin time, PT Prothrombin time, HB Hemoglobin, WBC White blood cell count, LOS Length of stay