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Some occupations are associated with an extra risk during pregnancy. Intensive action is not involved (the relative risk does not exceed the value of 2,000) but with regard to the number of women in these categories it is a significant extensive factor. Based on the results of an analysis of a group of all naturally terminated pregnancies in the district of Gottwaldov in 1981-1983 (6166 pregnancies), as compared with the mean an increased ratio of reproductive losses was recorded in charwomen, hairdressers, teachers, engineers with university education. Prematurity was recorded in particular in waitresses, shop-assistants, nurses, other health workers and women doctors. Workers on the whole have relatively favourable results, however, the risk in these occupation more frequently develops into actual failure of pregnancy (haemorrhage in the 1st trimester, imminent premature child birth). These workers are also more protected by legal leave after a previous childbirth, as compared with other occupations.