category[US Standard Certificate Of Birth Field 41]. Contains a list of risk factors that were encountered during this pregnancy. On the form, this is a multiple-choice question (i.e., "check all that apply"), although one of the choices is "None of the above", so if that one is chosen, there should not be any others chosen. Possible values include: Diabetes, Pre-pregnancy (diagnosis prior to this pregnancy); Diabetes, Gestational (diagnosis in this pregnancy); Hypertension, Prepregnancy (chronic); Hypertension, Gestational (PIH, preclampsia); Hypertension, Eclampsia; Previous preterm birth; Other previous poor pregnancy outcome (includes perinatal death, small-for-gestational age / intrauterine growth restricted birth); Pregnancy resulted from infertility treatment, Fertility-enhancing drugs, Artificial insemination or intrauterine insemination; Pregnancy resulted from infertility treatment, Assisted reproductive technology (e.g., in vitro fertilization (IVF) gamete intrafallopian transfer (GIFT)); Mother had a previous cesarean delivery - if yes, how many**; None of the above. **=if "Mother had a previous cesarean delivery" is chosen, a subclass of RiskFactor is used to contain the number of previous cesarean deliveries.