As Carolyn Dicey Jennings and I have documented, academic philosophy in the United States is highly gender skewed, with gender ratios more characteristic of engineering and the physical sciences than of the humanities and social sciences. However, unlike engineering and the physical sciences, philosophy appears to have stalled out in its progress toward gender parity.
Some of the best data on gender in U.S. academia are from the National Science Foundation's Survey of Earned Doctorates (SED). In an earlier post, I analyzed the philosophy data since 1973, creating this graph:
The quadratic fit (green) is statistically much better than the linear fit (red; AICc .996 vs .004), meaning that it is highly unlikely that the apparent flattening is chance variation from a linear trend.
Since the 1990s, the gender ratio of U.S. PhDs in philosophy has hovered steadily around 25-30%.
The SED site contains data on gender by broad field, going back to 1979. It is interesting to juxtapose these data with the philosophy data. (The philosophy data are noisier, as you'd expect, due to smaller numbers relative to the SED's broad fields.)
The overall trend is clear: Although philosophy's percentages are currently similar to the percentages in engineering and physical sciences, the trend in philosophy has flattened out in the 21st century, while engineering and the physical sciences continue to make progress toward gender parity. All the broad areas show roughly linear upward trends, except for the humanities which appears to have flattened at approximately parity.
These data speak against two reactions that I have sometimes heard to Carolyn's and my work on gender disparity in philosophy. One reaction is "well, that just shows that philosophy is sociologically more like engineering and the physical sciences than we might have previously thought". Another is "although philosophy has recently stalled in its progress toward gender parity, that is true in lots of other disciplines as well". Neither claim appears to be true.
[I am leaving for Hong Kong later today, so comment approval might be delayed, but please feel free to post your thoughts and I'll approve them and respond when I can!]