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Table 3 Mann–Whitney U/Chi-square testing of physiologic and demographic data for improved/not improved (1–3 months and 1–6 months)

From: Time spent above optimal cerebral perfusion pressure is not associated with failure to improve in outcome in traumatic brain injury

Variable

1 month → 3 months

1 month → 6 months

Improved median (IQR)

Not improved median (IQR)

p value

Improved median (IQR)

Not improved median (IQR)

p value

Age (years)

37.5 (25–49)

49 (33–62)

0.0263

36 (24–50)

52 (36–65.2)

0.0056

Sex (% Male)

83.30%

78.70%

0.9373

84.90%

76%

0.5580

Admission GCS total

7 (5–8)

6 (4–8)

0.9263

7 (5–8)

6 (4–8)

0.5700

Admission GCS motor

4.5 (3–5)

4 (2–5)

0.4953

4 (3–5)

4 (2–5)

0.3518

Admission GCS eyes

1 (1–2)

1 (1–2)

0.9322

1 (1–2)

1 (1–2)

1.0000

Admission GCS verbal

1 (1–1)

1 (1–2)

0.5914

1 (1–1)

1 (1–2)

0.8315

Admission pupil response (% bilaterally reactive)

64.30%

57.40%

0.7770

62.30%

58%

0.8016

Marshall CT grade

4 (3–5)

5 (3–5)

0.5976

4 (3–5)

5 (4–5)

0.3099

Rotterdam CT grade

4 (3.25–5)

4 (4–6)

0.9131

4 (4–5)

4 (4–6)

0.8851

Helsinki CT score

6 (4–9)

6 (4–9)

0.9398

6 (4–9)

7 (5–9)

0.5700

Stockholm CT score

3.1 (2.6–3.77)

3.2 (2.4–3.7)

0.9338

3.1 (2.9–3.8)

3.2 (2.22–3.68)

0.8276

Number with hypoxia episode

38.10%

32.80%

0.9457

37.70%

32%

0.7992

Number with hypotension episode

14.30%

8.20%

0.7857

17%

4%

0.1532

Number with traumatic SAH

97.60%

95.10%

0.9593

98.10%

94%

0.7722

Number with epidural hematoma

11.90%

9.80%

0.9920

13.20%

8%

0.7669

Admission hemoglobin

136 (120–148)

129 (113–143)

0.3534

138 (116–149)

128 (113–140)

0.1012

Admission serum glucose

8.05 (7.15–10.1)

8.2 (7–11)

0.9622

8.1 (7–10.2)

8.05 (7–10.9)

0.8462

Length of hospital stay

42 (30–79)

11 (6.5–25.5)

 < 0.0001

36.5 (22–62.5)

9.5 (6–21)

 < 0.0001

Length of ICU stay

11.5 (4.25–18)

7 (4–11)

0.1471

11 (4–17)

6.5 (4–11)

0.1110

Mean MAP (mmHg)

84.1 (80.7–92.1)

82.8 (78.6–87.8)

0.4825

84.6 (81.1–89.4)

81.2 (78.1–87.9)

0.1200

Mean ICP (mmHg)

8.95 (5.51–12)

9.01 (5.98–13.3)

0.8964

9.13 (5.95–12.5)

8.73 (5.5–12.3)

0.9920

 % Time ICP > 20 mmHg

1.06 (0–5.19)

1.19 (0.136–5.76)

0.5918

1.66 (0–5.76)

1.14 (0.142–5.26)

0.7571

 % Time ICP > 22 mmHg

0.489 (0–2.58)

0.767 (0.0852–4)

0.4845

0.923 (0–3.02)

0.667 (0.0865–3.33)

0.6923

Mean CPP (mmHg)

74.4 (71.2–80.3)

73.4 (69–78.6)

0.3447

75.1 (71.3–80.6)

73 (68.1–76.5)

0.0659

 % Time CPP < 60 mmHg

4.14 (1.47–8.85)

4.5 (1.04–9.87)

0.9610

3.81 (1.45–7.7)

5.3 (1.22–14.3)

0.3558

 % Time CPP > 70 mmHg

65.7 (54.5–80.7)

61.4 (39.6–76.1)

0.3449

67.2 (54.9–82.8)

56 (36.2–73.5)

0.0657

Mean PRx

0.102 (0.0111–0.212)

0.178 (0.074–0.363)

0.0895

0.136 (0.0347–0.237)

0.177 (0.079–0.364)

0.1375

 % Time PRx > 0

60.2 (51.6–74.1)

68.5 (58.9–86.6)

0.0945

62.5 (51.9–78.4)

67.7 (59–87.2)

0.1301

 % Time PRx > 0.25

35.9 (26.4–46.9)

45 (31.8–68.2)

0.0925

38.6 (27.3–54.5)

42.7 (32.3–68.6)

0.1555

 % Time PRx > 0.35

26.7 (19–35.3)

33.4 (23.9–57.3)

0.0860

27.4 (19.1–39.6)

32.6 (23.4–56.7)

0.1590

Mean PAx

−0.0507 (−0.142 to 0.0302)

0.0525 (−0.0984 to 0.232)

0.0115

−0.0437 (−0.142 to 0.0607)

0.0463 (−0.0968 to 0.231)

0.0464

 % Time PAx > 0

43.2 (34–53.8)

58.9 (38.7–76.1)

0.0133

44.8 (33.9–58.9)

55.6 (38.8–77)

0.0443

 % Time PAx > 0.25

17.7 (12.6–27.5)

30.7 (17.3–51.3)

0.0125

18.5 (12.5–29.4)

30 (17.3–50.6)

0.0440

Mean RAC

−0.328 (−0.432 to −0.175)

−0.127 (−0.313 to 0.00493)

0.0085

−0.285 (−0.425 to −0.153)

−0.123 (−0.314 to 0.0205)

0.0161

 % Time RAC > -0.10

25.3 (13–42.2)

43.4 (27.4–61.9)

0.0107

29.4 (14.3–46)

44.8 (27.3–63.3)

0.0282

 % Time RAC > -0.05

22.3 (10.8–37)

38.6 (23.3–56.9)

0.0116

25.6 (12–39.6)

39.4 (23.2–58.6)

0.0240

Mean CPPopt–PRx

74.4 (68.7–81.2)

74.1 (69.5–79.9)

0.9416

74.4 (70–83.6)

73.9 (69.2–79.1)

0.7562

 % Time ΔCPPopt–PRx > 5 mmHg

26.5 (17.9–33.8)

23.7 (15–33.4)

0.5590

27.9 (18.6–34.9)

21.6 (14.5–29.1)

0.0665

 % Time ΔCPPopt–PRx > 10 mmHg

12.5 (8.88–19.8)

10.1 (5.47–17.3)

0.1837

12.5 (8.99–20.8)

8.62 (5.49–15.7)

0.0465

 % Time ΔCPPopt–PRx < −5 mmHg

25.4 (15.7–32.8)

24.1 (17.4–37.4)

0.9213

23.6 (14.7–32.9)

25.7 (19.1–37.9)

0.2451

 % Time ΔCPPopt–PRx < −10 mmHg

11.9 (5.17–19)

9.82 (4.5–18.9)

0.9771

9.09 (4.5–17.9)

11.7 (5.61–20.6)

0.3974

 % Time CPP > ULR–PRx

12.9 (6.27–20.3)

15 (7.51–22.6)

0.5879

14.5 (6.94–24)

14.5 (7.74–22)

0.9307

 % Time CPP < LLR–PRx

9.15 (5.36–23.1)

14.2 (5.91–26.7)

0.4801

9.86 (4.58–23.4)

14.4 (6.06–27)

0.2648

Mean CPPopt–PAx

74.6 (71.8–82.3)

75.7 (71.2–82.6)

0.9458

75.7 (71.8–82.8)

74.9 (71.2–79.6)

0.7410

 % Time ΔCPPopt–PAx > 5 mmHg

26.3 (15.7–35.1)

19.8 (13–28.7)

0.1479

27.4 (18.7–35.1)

18.3 (12.3–27.4)

0.0281

 % Time ΔCPPopt–PAx > 10 mmHg

12.3 (6.38–22.5)

8 (4.43–14.2)

0.0924

12.9 (6.57–22.7)

7.03 (4.2–12.1)

0.0323

 % Time ΔCPPopt–PAx < −5 mmHg

29.9 (18.3–37.8)

30.1 (21.1–41)

0.9182

28.2 (17.1–37.5)

31.7 (22.9–43.8)

0.2280

 % Time ΔCPPopt–PAx < −10 mmHg

12.7 (6.42–25.5)

16.5 (9.77–24.5)

0.6001

12 (5.44–25.2)

17 (10.4–25.1)

0.1347

 % Time CPP > ULR–PAx

4.2 (2.46–8.94)

7.22 (3.07–16.4)

0.1471

5.68 (2.59–10.8)

5.53 (2.85–14.7)

0.5554

 % Time CPP < LLR–PAx

4.98 (2.1–10)

10.3 (3.04–29.7)

0.0646

4.51 (2.1–10.1)

11.8 (3.56–29.4)

0.0307

Mean CPPopt–RAC

72.9 (70.1–78.4)

73.4 (69.1–79.7)

0.9348

73.2 (70–79.5)

73.2 (68.5–78.5)

0.7609

 % Time ΔCPPopt–RAC > 5 mmHg

31.6 (15.4–41)

24.6 (15–33.3)

0.3693

31.4 (17.5–41.3)

23.8 (14.3–29.8)

0.0480

 % Time ΔCPPopt–RAC > 10 mmHg

15.1 (7.46–25.4)

10.5 (6.37–16.7)

0.2307

14.5 (8.62–25.8)

9.56 (6.15–15.9)

0.0456

 % Time ΔCPPopt–RAC < -5 mmHg

21.9 (11.2–33.7)

23.1 (14.1–35.4)

0.7775

19.2 (9.01–32.1)

27 (16.1–38.8)

0.0714

 % Time ΔCPPopt–RAC < -10 mmHg

9.01 (2.52–17.9)

10.7 (5.97–18.3)

0.4729

7.94 (2.51–15.4)

13.7 (7.2–18.5)

0.0608

 % Time CPP > ULR–RAC

3.3 (1.48–6.44)

4.34 (1.7–11.9)

0.3634

3.48 (1.83–7.47)

4.08 (1.64–10.5)

0.9204

 % Time CPP < LLR–RAC

3.7 (1.03–6.78)

4.37 (1.99–14.8)

0.3757

3.73 (1.02–7.4)

4.43 (2.01–14.5)

0.3504

  1. All p values have been adjusted using the False Discovery Rate (FDR) method
  2. AMP pulse amplitude of ICP, CPP cerebral perfusion pressure, CPPopt cerebral perfusion pressure optimum, ΔCPPopt CPP—CPPopt, CT computed tomography, GCS Glasgow Coma Scale, ICP intracranial pressure, ICU intensive care unit, IQR interquartile range, LLR lower limit of reactivity, MAP mean arterial pressure, mmHg millimeters of mercury, PAx pulse amplitude index, PRx pressure reactivity index, RAC correlation (R) between slow-waves of AMP (A) and CPP (C), SAH subarachnoid hemorrhage, ULR upper limit of reactivity
  3. Bolded p values are those reaching statistical significance, p < 0.05