A juror in Bill Cosby’s sexual assault trial has said it was the comedian’s own words that lead to his conviction.

Harrison Snyder was one of 12 jurors who found Cosby guilty of assaulting Andrea Constand in a trial last week. Mr Snyder, the youngest of the jurors, said it was Cosby’s testimony in a 2005 deposition that sealed his fate.

“I think it was his deposition, really. Mr Cosby admitted to giving these Quaaludes to women, young women, in order to have sex with them,” the 22-year-old told ABC’s Good Morning America.

In a recently unsealed deposition, Cosby admitted to obtaining Quaaludes – a powerful sedative outlawed in the 1980s – and giving them to at least one young woman with whom he intended to have sex.

The admission came during a civil case filed by Ms Constand. The former basketball player accused Cosby of giving her pills that left her “frozen” and unable to consent before sexually assaulting her in 2004.

In court this month, Ms Constand’s attorneys suggested the pills were Quaaludes. Cosby’s defence team said they were were the over-the-counter allergy drug Benadryl.

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The prosecution called five other women to the stand during the trial, in an attempt to prove a pattern of behaviour by Cosby. All of the women testified that the comedian had plied them with drugs or alcohol before sexually assaulting them.

But Mr Snyder said he would have reached the same conclusion without hearing from the other women.

“In the deposition [Cosby] stated that he gave these drugs to other women,” Mr Snyder said. “I don’t think it necessarily mattered that these other five women were here because he said it himself.”

Bill Cosby: Career in pictures Show all 20 1 /20 Bill Cosby: Career in pictures Bill Cosby: Career in pictures Bill Cosby Winner of his first Emmy for 'I Spy' is Bill Cosby being congratulated by his wife Camille held at Americana Hotel, 1966 Bill Cosby: Career in pictures Bill Cosby Bill Cosby in 'I Spy', 1960s Bill Cosby: Career in pictures Bill Cosby Bill Cosby in July 1973 in Perth Bill Cosby: Career in pictures Bill Cosby Bill Cosby and Richard Pryor in 'California Suite', 1978 Bill Cosby: Career in pictures Bill Cosby Bill Cosby and Elmo in Sesame Street, 1989 Bill Cosby: Career in pictures Bill Cosby Bill Cosby poses for a picture with Florence Griffith-Joyner in June 1989 Bill Cosby: Career in pictures Bill Cosby Comedian Bill Cosby back in 1992 Rex Features Bill Cosby: Career in pictures Bill Cosby A scene from a 1992 episode of 'The Cosby Show' AP Bill Cosby: Career in pictures Bill Cosby US Monica Seles breaks into laughter as she jokes with comedian Bill Cosby during a celebrity match in the stadium at the US Open for the Arthur Ashe AIDS Challenge on 27 August 1995 Bill Cosby: Career in pictures Bill Cosby Bill Cosby meets Toronto Blue Jays' All-Star Joe Carter after the Stars played the Stripes in the Celebrity All-Star game which preceded workouts for the 67th All-Star Game at Veterans Stadium on 8 July 1996 in Philadephia Bill Cosby: Career in pictures Bill Cosby Co-hosts Oprah Winfrey and Bill Cosby joke with each other during the opening of the 2000 Essence Awards 14 April 2000 at Radio City Music Hall in New York City Bill Cosby: Career in pictures Bill Cosby Bill Cosby jokes with baseball great Hank Aaron after they both received the Presidential Medal of Freedom Award from U.S. President George W. Bush during a ceremony on 9 July 2002 at the White House in Washington Bill Cosby: Career in pictures Bill Cosby Bill Cosby poses backstage after winning the 'Bob Hope Humanitarian Award' during the 55th Annual Primetime Emmy Awards at the Shrine Auditorium on 21 September 2003 in Los Angeles Bill Cosby: Career in pictures Bill Cosby 'Tonight Show' host Jay Leno and comedian Bill Cosby laugh during a surprise visit by Cosby to sign a Harley-Davidson motorcycle that Leno is using to raise money for the victims of Hurricane Katrina at NBC studios on 9 September 2005 in Burbank, California Bill Cosby: Career in pictures Bill Cosby Bill Cosby speaks during a taping of 'Meet the Press' at the NBC studios on 14 October 2007 in Washington Bill Cosby: Career in pictures Bill Cosby Bill Cosby at the 12th annual Mark Twain Prize for American Humor at the John F. Kennedy Center on 26 October 2009 in Washington Bill Cosby: Career in pictures Bill Cosby Bill Cosby speaks at the National Action Network's 20th annual Keepers of the Dream Awards gala in New York on 6 April 2011 Reuters Bill Cosby: Career in pictures Bill Cosby Bill Cosby during the 100th anniversary celebration of the Beverly Hills Hotel & Bungalows supporting the Motion Picture & Television Fund and the American Comedy Fund, 2012 Getty Images Bill Cosby: Career in pictures Bill Cosby Bill Cosby speaks onstage at the Thurgood Marshall College Fund 25th Awards Gala on 11 November 2013 in Washington Bill Cosby: Career in pictures Bill Cosby Bill Cosby performs at the Treasure Island Hotel & Casino on 26 September 2014 in Las Vegas

More than 50 women have publicly accused Cosby of sexually assaulting them, often with the help of drugs or alcohol.

Mr Snyder said he knew little of Cosby, and nothing of the charges against him, before entering the courtroom. He also knew little about the “Me Too” movement, in which dozens of women have come forwards with allegations of sexual assault against powerful, male celebrities.

“I really only found out about it after I got home and I looked online to see what everything was,” Mr Snyder said.