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Table 1 PubMed search results of various query terms related to association studies

From: PADB : Published Association Database

Initial Query Results Combined Query Results
   NOT (odds ratio*) NOT (relative risk*) NOT (hazard ratio*) NOT (risk ratio*) NOT (case-control) NOT (cohort*) NOT (associa*)
odds ratio* 67,815 - 65,047 66,898 67,238 50,804 56,612 24,427
relative risk* 32,280 29,512 - 31,944 31,830 27,878 24,374 14,907
hazard ratio* 8,927 8,110 8,591 - 8,868 8,598 5,848 3,548
risk ratio* 3,694 3,117 3,244 3,535 - 3,377 2,814 1,841
case-control 92,264 75,253 87,862 91,935 91,947 - 83,109 50,155
cohort* 129,128 117,925 121,222 126,049 128,248 119,973 - 75,875
associa* 1,591,541 1,548,153 1,574,168 1,586,162 1,589,688 1,549,432 1,538,288 -
  1. The search results for various keywords related to association studies in PubMed seldom overlap. The search for 'odds ratio*' in PubMed retrieved 67,815 abstracts when accessed on 30 November 2006. Among these, 65,047 (95.9%), 66,998 (98.7%) and 67,238 (99.2%) abstracts did not contain 'relative risk*', 'hazard ratio*' or 'risk ratio*', respectively. Moreover, 50,804 (74.9%) and 56,612 (83.5%) abstracts did not contain 'case-control' or 'cohort*', respectively. By comparison, 75,253 (81.6%) abstracts out of 92,264 containing 'case-control' and 117,925 (91.3%) abstracts out of 129,128 containing 'cohort*' did not contain 'odds ratio*'.