Kay, Katty and Claire Shipman. The Confidence Gap. The Atlantic. May 2014. Magazine Article.
 The Always Confidence & Puberty Wave IV Study was conducted by MSLGROUP Research utilizing Research Now Panels that surveyed a total of 1,514 Americans. There was a nationally representative sample group of 1,006 females aged 16 to 24 year old and 508 males aged 16 to 24. The survey was implemented between the dates of December 30, 2015 through January 7, 2016.
See more at: http://news.pg.com/press-release/pg-corporate-announcements/half-girls-quit-sports-end-puberty-new-always-likeagirl-vid#sthash.Rs3nFptH.dpuf