Table 1 General characteristics of the sample of study
Characteristic | Number (%) |
|---|---|
Total number of articles | 736 (100) |
Articles per journala | |
BMJ | 289 (39.3) |
The Lancet | 132 (17.9) |
JAMA | 113 (15.3) |
Arch Intern Med | 112 (15.2) |
Ann Intern Med | 70 (9.5) |
New Engl J Med | 13 (1.8) |
PLoS Med | 7 (0.9) |
Citations per journalb | |
BMJ | 37,930 (29.0) |
The Lancet | 34,911 (26.7) |
JAMA | 25,273 (19.3) |
Ann Intern Med | 13,381 (10.2) |
Arch Intern Med | 11,945 (9.1) |
New Engl J Med | 6,992 (5.3) |
PLoS Med | 212 (0.1) |
Articles per period of publication | |
1985 to 1989 | 3 (0.4) |
1990 to 1994 | 53 (7.2) |
1995 to 1999 | 140 (19.0) |
2000 to 2004 | 166 (22.6) |
2005 to 2009 | 231 (31.4) |
2010 to 2012 | 143 (19.4) |
Country of publication (first author)c | |
USA | 214 (29.1) |
UK | 207 (28.1) |
Canada | 94 (12.8) |
Australia | 36 (4.9) |
Switzerland | 26 (3.5) |
France | 26 (3.5) |
Denmark | 20 (2.7) |
Italy | 20 (2.7) |
Number of authors per paper | |
1 | 41 (5.6) |
2 to 3 | 166 (22.5) |
4 to 6 | 297 (40.3) |
> 7 | 232 (31.5) |