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. Author manuscript; available in PMC: 2009 May 6.
Published in final edited form as: J Pain. 2009 May;10(5):447–485. doi: 10.1016/j.jpain.2008.12.001

Figure 1.

Figure 1

Average annual percentage increase in publications over each 2-year period after 1980, which served as the reference year. These percentages were computed by conducting literature searches using PubMed for every year since 1980. For 2008, the first 6 months was collected and doubled to obtain an annualized estimate. The PubMed search for Sex, Gender, and Pain was completed using the following Boolean combination (Sex differences OR Gender differences) AND Pain.