passages.id: split_4_test_2264_passage
passages.type: progene_text
passages.text: Cross tabulation showed that 20 children ( 26 % ) were nod + / CagA + , 12 ( 15.5 % ) nod + / CagA - , 12 ( 15.5 % ) nod - / CagA + and 33 ( 43 % ) nod - / CagA - .