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Table 4 Factors that affect retrieval of individual articles

From: Novel citation-based search method for scientific literature: a validation study

  

Co-citation search

Co-citation + citation searches

Total

Number retrieved

Percentage*

Number retrieved

Percentage*

Overall

4261

1938

45.5

2674

62.8

Times cited

 Not indexed

591

157

26.6

181

30.6

 0

365

1

0.3

176

48.2

 1–5

787

104

13.2

385

48.9

 6–9

411

150

36.5

237

57.7

 10–19

658

406

61.7

480

72.9

 20–49

862

616

71.5

691

80.2

  > 50

587

504

85.9

524

89.3

Indexed in WOS**

 No

703

184

26.2

235

33.4

 Yes

3558

1754

49.3

2439

68.5

Number of references

 Not indexed

591

157

26.6

181

30.6

  < 5

97

44

45.4

45

46.4

 5–9

108

65

60.2

75

69.4

  > =10

3465

1672

48.3

2373

68.5

Years since publication

 0–1

544

44

8.1

285

52.4

 1–2

487

118

24.2

243

49..9

 2–5

1081

402

37.2

606

56.1

 5–10

994

585

58.9

686

69.0

  > 10

1155

789

68.3

854

73.9

  1. *Percentage of articles included in reviews that were retrieved, by category. Query articles for all 250 reviews (n = 500) were removed from the dataset. **All articles are in WOS but not all are indexed. See methods for details