The Big 12 said on Wednesday that it would withhold millions of dollars in conference revenue from Baylor until an outside review determined that the athletic department was complying with Title IX guidelines and other regulations in the wake of a sexual-assault scandal that has rocked the university.

The actions against Baylor were the first by the Big 12 since the university was hit by a wave of complaints that it mishandled or tried to cover up assault allegations, many of them involving football players.

Baylor fired its football coach, Art Briles, last year and later parted ways with its president, Kenneth W. Starr, and its athletic director, Ian McCaw, after an investigation by a law firm found that allegations of sexual assault brought to the university’s attention were not dealt with appropriately.

The Big 12 paid out $30.4 million to each conference member last year. Baylor is not being fined, the conference said in a statement; 25 percent of Baylor’s annual conference payout is merely being placed in escrow pending a third-party verification of reforms at Baylor.