19.3 % of patients in video exoscopy group and 15.5 % in colposcopy group ( p = 0.67 ) had transformation zone ( TZ ) 3.45 / 151 ( 29.8 % ) of group A patients and 48/149 ( 32.2 % ) of group B patients underwent top-hat procedure , i.e. , one superficial excision followed by one deeper removal of the endocervical tissue ( p = 0.74 ) .