Periods | Total papers | Total major MeSH terms | Total frequency of major MeSH terms | Total major MeSH terms with high frequency (n, %) | Total frequency of major MeSH terms with high frequency (n, %) | N |
---|---|---|---|---|---|---|
1999 to 2003 | 2453 | 1362 | 9492 | 27 (1.98) | 4583 (48.28) | 34.57 |
2004 to 2008 | 3521 | 1792 | 13989 | 41 (2.29) | 7061 (50.47) | 39.43 |
2009–2014 | 4729 | 2093 | 19214 | 64 (3.06) | 10366 (53.95) | 41.83 |
Total | 10703 | 5247 | 42695 | 132 (2.52) | 22010 (51.76) | —— |