for women in the age group from 30 to 34 , a history of their pregnancies and deliveries seemed to have protective effects on stomach carcinogenesis ( rr = 0.36 , p less than 0.05 ) , whereas for those in the age group under 30 , it appeared to be a risk factor for stage iv stomach cancer ( rr = 4.42 , p less than 0.05 ) .
C0038351
stomach
C0278498
stage iv stomach cancer