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Table 5 Results of scientific literatures and patent analysis

From: Assessment of technological level of stem cell research using principal component analysis

Indicators

Year

CA

CN

DE

FR

UK

IL

JP

KR

SG

TW

US

Adult stem cell

            

 NP_Patent

1993

1

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

3

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

2012

3

n/a

3

4

3

6

8

4

6

4

79

 PII_Patent

1993

0.42

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

1.19

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

2012

0.36

n/a

n/a

2.96

n/a

0.18

2.22

n/a

0.81

n/a

1.06

 NP_Paper

1993

1

n/a

5

4

4

1

6

n/a

n/a

n/a

37

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

2012

80

747

169

105

137

33

194

198

30

64

694

 PII_Paper

1993

0.58

n/a

1.01

0.74

2.77

0.60

0.50

n/a

n/a

n/a

0.94

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

2012

1.04

0.49

1.32

1.12

1.56

0.95

0.88

0.87

1.32

0.77

1.42

Embryonic stem cell

            

 NP_Patent

1993

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

2012

1

n/a

n/a

1

3

2

10

2

3

1

55

 PII_Patent

1993

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

2012

n/a

n/a

n/a

n/a

n/a

n/a

1.99

n/a

0.28

n/a

1.04

 NP_Paper

1993

2

n/a

6

1

4

1

2

n/a

n/a

n/a

14

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

2012

31

109

54

25

67

18

56

44

20

10

261

 PII_Paper

1993

6.43

n/a

0.85

0.02

0.10

0.37

0.15

n/a

n/a

n/a

0.78

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

2012

0.95

0.70

0.93

1.17

1.23

0.60

0.86

0.51

0.87

0.34

1.25

Induced pluripotent stem cell

            

 NP_Patent

1993

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

2012

n/a

n/a

n/a

n/a

n/a

n/a

4

n/a

n/a

1

2

 PII_Patent

1993

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

2012

n/a

n/a

n/a

n/a

n/a

n/a

1.75

n/a

n/a

n/a

n/a

 NP_Paper

1993

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

2012

7

51

18

9

12

6

63

7

1

11

111

 PII_Paper

1993

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

n/a

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

â‹®

2012

1.64

0.66

0.81

1.76

1.86

1.29

0.69

0.84

0.62

1.07

1.16

  1. CA Canada, CN China, FR France, DE Germany, IL Israel, JP Japan, SG Singapore, KR Korea, TW Taiwan, UK United Kingdom, US United States, NP_Patent number of patents, PII_Patent Patent Impact Index, NP_Paper Number of papers, PII_Paper Paper Impact Index
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