Going to be honest here, I think the more interesting statistic is that there are only 590 voters in an active user base of about 30,000. I think this may reflect a change in the degree of importance the community places on the Arbitration Committee.
On the "female editors participating" front, I'm fairly certain just from looking at the names and picking out ones I recognize as being women editors, that at least 10% of the participating electorate was female. I never bothered to set my gender preference (indeed, I know that preference was added to accommodate languages for which the word "user" is gender-specific, such as German, Spanish, etc), even though I've been openly female for most of my wiki-career. (I realise that it sounds like I "came out" as being a woman...when I look back on the earliest years of enwiki, there was a far less significant gender imbalance.)
Risker/Anne