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Table 4 Comparison of papers published between older (before February 2008) and newest ones (after June 2008)

From: Hundred most cited articles in perioperative neurocognitive disorder: a bibliometric analysis

Parameter

Older group (n = 50)

Newest group (n = 50)

P value

Quantitative (mean, range)

Total Citations, number

268.6 (122–1248)

201.6 (111–451)

0.055

Citations/year, number

15.3 (3.8–64.9)

24.9 (10.3–97.5)

0.001

Author, number

6.9 (1–20)

8.1 (1–20)

0.190

Qualitative (n, %)

Multiple institutions

28 (46 %)

35 (70 %)

0.147

Article focus

  

0.027

Clinical outcomes

31 (62 %)

23 (46 %)

 

Basic science outcomes

8 (16 %)

20 (40 %)

 

Review articlea

11(22 %)

7 (14 %)

 

Research areas

  

0.086

Anesthesiology

19 (38 %)

18 (36 %)

 

General & Internal. Medicine

11 (22 %)

8 (16 %)

 

Geriatrics & Gerontology

9 (18 %)

5 (10 %)

 

Neurosciences & Neurology

2 (4 %)

10 (20 %)

 

Other topics

9 (18 %)

9 (18 %)

 

Funding disclosed

23(46 %)

38(76 %)

0.002

National/institutional

23/23 (100 %)

36/38 (95 %)

 

Industry

0/23 (0 %)

2/38 (5 %)

 

Open accessb

9 (18 %)

31 (62 %)

<0.001

  1. The publication year of the top 100 papers was range 1993 to 2016, the median year of publication was 2008. The top 100 papers were divided into 50 older papers (before February 2008) and 50 newest ones (after June 2008) according to the publication date order. Bold type indicated statistical significance. a, Both of expert opinions and meta-analysis articles are regarded as review articles here. b Open access journals are available for free public access.