Table 5. Temporal Trends in Article Influence Scores of Common Medical Journals Between 2001 and 2008.
| Journal | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | P trend |
| Allergy | 1.4877 | 1.6964 | 1.6234 | 1.7028 | 1.9319 | 2.1341 | 1.122 | 1.355 | 0.6576 |
| Am J Resp Crit Care Med | 1.8261 | 2.0711 | 2.2495 | 2.2829 | 2.4995 | 2.8246 | 2.877 | 3.125 | <.0001↑ |
| Ann Neurol | 3.3780 | 3.2923 | 3.2187 | 3.2531 | 3.1068 | 3.1693 | 3.116 | 3.338 | 0.2938 |
| Ann Rheum Dis | 0.7720 | 0.80928 | 0.89922 | 0.98872 | 1.357 | 1.3905 | 1.660 | 1.802 | <.0001↑ |
| Art Rheum/Ar C Res | 1.9775 | 1.8535 | 4.2411 | 3.0898 | 2.4768 | 2.0633 | 2.119 | 2.062 | 0.6555 |
| Brain | 3.2601 | 3.1851 | 3.5698 | 3.458 | 3.601 | 3.4876 | 3.6 | 3.527 | 0.0311↑ |
| Chest | 0.94489 | 0.98896 | 1.0677 | 1.0967 | 1.1732 | 1.2089 | 1.349 | 1.516 | <.0001↑ |
| Circulation | 3.9945 | 4.018 | 4.0969 | 4.3223 | 4.2973 | 4.273 | 4.703 | 4.794 | 0.0007↑ |
| Clin Exp Allergy | 0.9400 | 0.78927 | 0.80948 | 0.7639 | 0.86069 | 0.84054 | 1.087 | 1.150 | 0.0853 |
| Clin Inf Dis | 1.1824 | 1.3578 | 1.5493 | 1.6781 | 2.1362 | 2.117 | 2.137 | 2.345 | <.0001↑ |
| Crit Care Med | 1.8261 | 2.0711 | 2.2495 | 2.2829 | 2.4995 | 2.8246 | 1.612 | 1.852 | 0.9762 |
| Critical Care | 1.8261 | 2.0711 | 2.2495 | 2.2829 | 2.4995 | 2.8246 | 1.129 | 1.346 | 0.4508 |
| Diabetes | 2.9060 | 2.8689 | 2.7892 | 3.0744 | 2.953 | 2.8948 | 2.923 | 2.989 | 0.3797 |
| Diabetes Care | 1.6899 | 2.0053 | 2.082 | 2.1942 | 2.4343 | 2.475 | 2.658 | 2.508 | 0.0004↑ |
| Eur Heart J | 1.2961 | 1.5694 | 1.7919 | 2.001 | 2.3426 | 2.5218 | 2.881 | 3.010 | <.0001↑ |
| Eur Resp J | 0.9766 | 1.0266 | 0.96665 | 1.035 | 1.188 | 1.4831 | 1.603 | 1.775 | 0.0007 |
| Gastroenterology | 3.4136 | 3.634 | 3.7531 | 3.6536 | 3.7979 | 3.8114 | 3.869 | 3.913 | 0.0018↑ |
| Gut | 1.7267 | 1.7749 | 1.7387 | 1.8418 | 1.9368 | 2.2264 | 2.489 | 2.551 | 0.0006↑ |
| Hepatology | 2.1530 | 2.3941 | 2.5945 | 2.681 | 2.8068 | 2.9349 | 2.981 | 3.363 | <.0001↑ |
| Intens Care Med | 0.7029 | 0.68186 | 0.82905 | 0.75332 | 0.92444 | 0.92381 | 1.021 | 1.214 | 0.0007↑ |
| J Allergy Clin Immunol | 1.4877 | 1.6964 | 1.6234 | 1.7028 | 1.9319 | 2.1341 | 2.074 | 2.488 | 0.0004↑ |
| J Am Coll Cardiol | 2.7043 | 2.6455 | 2.7964 | 3.0063 | 3.0826 | 3.3537 | 3.803 | 3.727 | 0.0002↑ |
| J Bone Miner Res | 2.2700 | 2.2391 | 2.1552 | 1.9007 | 2.2226 | 2.1188 | 2.078 | 2.295 | 0.8237 |
| J Clin Endocr Metab | 1.5449 | 1.589 | 1.7449 | 1.7975 | 1.8812 | 1.8724 | 1.797 | 1.803 | 0.0224↑ |
| J Clin Oncol | 2.5979 | 2.8226 | 3.1852 | 3.2224 | 3.3732 | 3.475 | 3.916 | 4.164 | <.0001↑ |
| J Infect Dis | 1.8863 | 1.9035 | 1.7964 | 1.8621 | 1.9332 | 2.049 | 2.051 | 2.064 | 0.0133↑ |
| J Natl Cancer I | 5.5065 | 5.6202 | 5.6551 | 5.4014 | 5.6045 | 5.4732 | 5.821 | 5.791 | 0.1822 |
| J Neurosci | 4.1098 | 3.9737 | 3.7925 | 3.6898 | 3.6531 | 3.4425 | 3.301 | 3.544 | 0.0014↓ |
| JAMA | 5.8387 | 6.8129 | 8.26 | 9.3565 | 9.7762 | 10.29 | 10.644 | 11.153 | <.0001↑ |
| Lancet | 4.6325 | 4.8334 | 5.4905 | 6.6371 | 7.7322 | 8.6351 | 9.318 | 9.953 | <.0001↑ |
| Lancet Infect Dis | n/a§ | n/a§ | n/a§ | 5.0478 | 4.9968 | 4.9689 | 4.795 | 4.689 | 0.0091↓ |
| Lancet Oncol | n/a§ | n/a§ | 2.1952 | 2.6062 | 2.61 | 2.6211 | 3.765 | 3.947 | 0.0110↑ |
| N Engl J Med | 11.571 | 12.484 | 13.166 | 14.399 | 15.183 | 16.825 | 17.864 | 18.764 | <.0001↑ |
| Rheumatology | 0.7807 | 2.0989 | 1.2218 | 1.0221 | 1.162 | 1.2518 | 1.237 | 1.188 | 0.8238 |
| Thorax | 1.3673 | 1.5481 | 1.4797 | 1.6867 | 1.8039 | 2.0772 | 2.098 | 2.280 | <.0001↑ |
§
n/a = not available.
Significant increase over time denoted by (↑), while significant decrease is denoted (↓).