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Table 2 Data structure for one patient

From: Utilizing heart rate variability to predict ICU patient outcome in traumatic brain injury

Time point

(Time period)

HRV features

HRV Euclidean distance features

HR

RR

……

SD2

Time points for calculation

DistHR

DistRR

…

DistSD2

1[0,0.5)*

57.7

1040.7

……

8.6

1–8

166.9

2884.1

32.6

166.9

2[0.5,1)

56.3

1066.0

……

12.4

2–9

167.3

2876.5

33.4

167.3

3[1,1.5)*

58.2

1030.6

 

10.0

3–10

168.6

2852.6

33.1

168.6

4[1.5,2)

59.4

1014.3

 

12.2

4–11

169.0

2846.2

33.3

169.0

5[2,2.5)*

60.2

998.8

 

11.3

5–12

168.4

2856.6

33.2

168.4

6[2.5,3)

58.2

1032.0

 

10.8

6–13

167.1

2880.3

33.1

167.1

7[3,3.5)*

60.4

996.3

 

14.8

7–14

167.1

2879.9

33.2

167.1

8[3.5,4)

61.5

975.8

 

11.4

8–15

165.9

2900.1

32.2

165.9

â‹®

â‹®

â‹®

……

â‹®

â‹®

â‹®

â‹®

…

â‹®

40 [19.5,20)*

62.8

957.8

……

15.1

40–47

259.3

2019.8

…

40.2

41 [20,20.5)

68.5

877.1

……

12.0

41–48

272.3

1870.5

…

39.0

  1. *[0, 0.5) represent the first 30 min (half an hour) of the ECG record.[20, 20.5) represents the ECG record from hour 20–20.5 h time point