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Pregnancy outcome for the total population with exposure to IFN (a), the population with confirmed exposure dates (b), subgroups, stratified by product (c and d) and by time of exposure (e–g). N and percentages refer to the number of pregnancies. Patients who stopped IFN before conception or had missing exposure data were excluded from this analysis.
IFN, IM interferon beta-1a or peginterferon beta-1a; IM, intramuscular.
