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Table 1 Baseline demographic characteristics of the participants

From: Association between preoperative platelet and 30-day postoperative mortality of adult patients undergoing craniotomy for brain tumors: data from the American College of Surgeons National Surgical Quality Improvement Program database

PLT (quartile)

Q1 (15.00–193.00)

Q2 (194.00–235.00)

Q3 (236.00–284.00)

Q4 (285.00–988.00)

P value

N (cases)

4482

4508

4521

4552

 

BMI, (Mean ± SD)

28.443 ± 6.144

28.825 ± 6.592

28.815 ± 7.034

28.751 ± 7.146

0.026

Na, (Mean ± SD)

138.848 ± 3.307

138.779 ± 3.096

138.690 ± 3.060

138.191 ± 3.237

< 0.001

Cr, (Mean ± SD)

0.918 ± 0.512

0.872 ± 0.465

0.840 ± 0.336

0.818 ± 0.439

< 0.001

WBC, median (quartile)

7.320 (5.600–10.100)

8.000 (6.200–10.900)

8.600 (6.700–11.700)

10.000 (7.600–13.500)

< 0.001

HCT, (Mean ± SD)

39.946 ± 5.203

40.765 ± 4.568

40.772 ± 4.499

39.773 ± 4.828

< 0.001

BUN, median (quartile)

16.527 (13.000–22.000)

16.000 (13.000–20.000)

16.000 (12.000–19.048)

16.000 (12.000–20.000)

< 0.001

Operation time, median (quartile)

179.000 (120.250–259.000)

183.000 (123.000–270.000

184.000 (122.000–273.000

178.000 (117.000–266.000)

0.014

Sex N (%)

    

< 0.001

 Male

2710 (60.464%)

2337 (51.841%)

1999 (44.216%)

1532 (33.656%)

 

 Female

1772 (39.536%)

2171 (48.159%)

2522 (55.784%)

3020 (66.344%)

 

Race N (%)

    

0.002

 White

3264 (72.825%)

3219 (71.406%)

3215 (71.113%)

3124 (68.629%)

 

 Asian

120 (2.677%)

137 (3.039%)

120 (2.654%)

149 (3.273%)

 

 African American

275 (6.136%)

292 (6.477%)

291 (6.437%)

357 (7.843%)

 

 Unknown race

823 (18.362%)

860 (19.077%)

895 (19.797%)

922 (20.255%)

 

Age ranges N (%)

    

< 0.001

 18–40

586 (13.075%)

749 (16.615%)

806 (17.828%)

780 (17.135%)

 

 41–60

1622 (36.189%)

1841 (40.839%)

1938 (42.867%)

2098 (46.090%)

 

 61–80

2034 (45.382%)

1790 (39.707%)

1639 (36.253%)

1583 (34.776%)

 

 >81

240 (5.355%)

128 (2.839%)

138 (3.052%)

91 (1.999%)

 

Diabetes N (%)

    

< 0.001

 No

3867 (86.278%)

4000 (88.731%)

4032 (89.184%)

4039 (88.730%)

 

 Yes (Noninsulin)

368 (8.211%)

337 (7.476%)

300 (6.636%)

336 (7.381%)

 

 Yes (Insulin)

247 (5.511%)

171 (3.793%)

189 (4.180%)

177 (3.888%)

 

Smoking status N (%)

    

< 0.001

 No

3783 (84.404%)

3687 (81.788%)

3590 (79.407%)

3502 (76.933%)

 

 Yes

699 (15.596%)

821 (18.212%)

931 (20.593%)

1050 (23.067%)

 

Severe COPD N (%)

    

< 0.001

 No

4302 (95.984%)

4329 (96.029%)

4324 (95.643%)

4287 (94.178%)

 

 Yes

180 (4.016%)

179 (3.971%)

197 (4.357%)

265 (5.822%)

 

Hypertension N (%)

    

< 0.001

 No

2605 (58.121%)

2810 (62.334%)

2872 (63.526%)

2871 (63.071%)

 

 Yes

1877 (41.879%)

1698 (37.666%)

1649 (36.474%)

1681 (36.929%)

 

Dialysis

    

< 0.001

 No

4455 (99.398%)

4500 (99.823%)

4512 (99.801%)

4540 (99.736%)

 

 Yes

27 (0.602%)

8 (0.177%)

9 (0.199%)

12 (0.264%)

 

Steroid use for chronic condition N (%)

    

< 0.001

 No

3601 (80.344%)

3911 (86.757%)

3917 (86.640%)

3896 (85.589%)

 

 Yes

881 (19.656%)

597 (13.243%)

604 (13.360%)

656 (14.411%)

 

Bleeding disorders N (%)

    

< 0.001

 No

4283 (95.560%)

4448 (98.669%)

4459 (98.629%)

4500 (98.858%)

 

 Yes

199 (4.440%)

60 (1.331%)

62 (1.371%)

52 (1.142%)

 

Preoperation transfusions N (%)

    

0.003

 No

4457 (99.442%)

4500 (99.823%)

4512 (99.801%)

4531 (99.539%)

 

 Yes

25 (0.558%)

8 (0.177%)

9 (0.199%)

21 (0.461%)

 

Preoperation systemic sepsis N (%)

    

< 0.001

 No

4321 (96.408%)

4357 (96.650%)

4392 (97.147%)

4323 (94.969%)

 

 SIRS

160 (3.570%)

147 (3.261%)

127 (2.809%)

225 (4.943%)

 

 Septic Shock

1 (0.022%)

4 (0.089%)

2 (0.044%)

4 (0.088%)

 

Emergency case N (%)

    

0.578

 No

4194 (93.574%)

4215 (93.500%)

4232 (93.608%)

4232 (92.970%)

 

 Yes

288 (6.426%)

293 (6.500%)

289 (6.392%)

320 (7.030%)

 

30 day mortality events, N (%)

    

< 0.001

 No

4313 (96.229%)

4415 (97.937%)

4444 (98.297%)

4439 (97.518%)

 

 Yes

169 (3.771%)

93 (2.063%)

77 (1.703%)

113 (2.482%)

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