Ditto what Zico said.
Aslief: It's not just JWs, any "new" religion
I'd modify to say ALL religions. At least the ones in the Western world.
http://www.barna.org/FlexPage.aspx?Page=BarnaUpdate&BarnaUpdateID=47
From that article:
Barna also noted that another significant concern is the low levels of religious participation among women who are members of the Buster generation - those who are 34 and younger. For virtually every religious activity measured, Buster women - not unlike Buster men - were less likely than older generations to participate in such spiritual pursuits. The exception was meeting with a spiritual mentor or coach. Barna indicated that thus far it appears that the Church has not adequately addressed the needs of this generation.