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<p>We will take the American Mathematics Competition as an example. I’m sure this could be applied to many similar contests in different math/science/technology fields.</p>
<p>According to the statistics on the preliminary round this year, males not only outnumbered females in number of takers (something, perhaps, you attest to self-selection), but did better on average. Furthermore, a headcount at the higher levels (USAMO and above) for previous years suggests an overwhelming male majority (to the point of unanimity).</p>