Percentage of participants with clinical remission at Week 54 as assessed by PUCAI score was reported. Clinical remission as measured by the PUCAI score was a PUCAI score <10. PUCAI score was intended for pediatric participants with UC. PUCAI consisted of the following 6 subscores with scores as: abdominal pain (no pain =0, pain can be ignored =5, pain cannot be ignored =10); rectal bleeding (none =0, small amount only [in less than 50 percent (%) of stools] =10, small amount with most stools =20, large amount [>50% of the stool content] =30); stool consistency of most stools (formed =0, partially formed =5, completely unformed =10); number of stools per 24 hours (0-2 =0, 3-5 =5, 6-8 =10, >8 =15); nocturnal bowel movement (no =0, yes =10); activity level (no limitation of activity =0, occasional limitation of activity =5, severely restricted activity =10). PUCAI score = sum of scores of 6 items; score range of 0= no severity to 85= extreme severity.