Table 1 Current biobank content

Number of patients

73

109

34

12

228

Number of samples

113

132

34

14

293

Number of samples associated with CSF

40

36

–

–

76

Mean samples per patient

1.58

1.21

1.00

1.17

1.29

Sample breakdown by hardware type

 Samples which include a ventricular catheter

101

81

28

11

221

 Samples which include a valve

2

88

5

1

96

 Samples which include a peritoneal catheter

2

33

4

1

40

 Samples which include an EVD

5

1

–

–

6

 Samples which include a subdural catheter

3

5

–

–

8

 Samples which include a reservoir

1

14

–

1

16

Number of samples per year

 2015

–

24

–

–

24

 2016

49

15

–

–

64

 2017

32

27

1

–

60

 2018

28

37

23

1

89

 2019

5

29

10

12

56

Collection rates as a percentage of total revision surgeries performed

 2015

–

Missing

–

–

–

 2016

31%

Missing

–

–

–

 2017

15%

42%

3%

–

20%

 2018

19%

43%

15%

33%

22%

 2019

7%

46%

7%

28%

18%