They used TheyFit condoms for this study, though it isn’t stated anywhere in the actual article. I can’t remember where I found that out, and I’m coming up empty trying to search now, but I did find some other studies done by the same group of researchers using TheyFit condoms:
Reece, M., Herbernick, D., Monahan, P., Sanders, S., & Yarber, W.L. An experimental assessment
Of the TheyFit condom. Annual Meeting of the Association for Standards, Testing, and Materials,
Reno, Nevada, 2005.
Reece, M., Herbenick, D., Monahan, P., Sanders, S., & Yarber, W.L Findings from the experimental
Trial of the TheyFit condom among regular condom users in the United States. Annual Meeting of the
International Organization for Standardization, Berlin, Germany, 2005.
So the researchers were likely using TheyFit’s instructions for measurement, which can be found here: http://www.they … /print-a-fitkit
Length was measured from the bottom, "as far as the condom would unroll on the underside," while the girth measurement was a straightforward MSEG.