At follow-up ( 4.1 + / - 1.5 years ) , 86 % of conventionally treated patients and 87 % of biofeedback-treated patients had improvement in encopresis ; 62 % of conventionally treated patients , 50 % of successful biofeedback-treated patients , and 23 % of unsuccessful biofeedback-treated patients had recovered from chronic constipation and encopresis .
