Only 3.1% had upper gastrointestinal tract involvement. Severity of symptoms ranged from asymptomatic or S0 17.2% to severe or S4 23.1% at study entry. 27.8% had mild activity S1, and 32.0% had moderate activity S2.
En cuanto a severidad, 17,2% de individuos con colitis ulcerativa son asintomáticos S0 al ingreso al estudio, 27,8% presentan actividad leve S1, 32,0% moderada S2 y 23,1% severa S4.