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  lüll Prenatal and perinatal risk factors for autism: a review and integration of  findings Kolevzon A; Gross R; Reichenberg AArch Pediatr Adolesc Med  2007[Apr]; 161 (4): 326-33OBJECTIVE: To review the evidence for the presence of prenatal and perinatal  factors that affect the risk of autism and autism spectrum disorders. DATA  SOURCES: Relevant articles were identified by searching MEDLINE, screening  reference lists of original studies, and searching major journals likely to  publish epidemiological studies on the topic. STUDY SELECTION: For inclusion in  this review, studies required (1) a well-defined sample of cases drawn from  population-based registers or cohorts; (2) standardized, prospectively collected  obstetric information from birth records or registers; (3) comparison subjects  drawn from the general population with information on obstetric complications  collected from the same source; and (4) a standardized format for presentation of  data, allowing for comparisons among studies. Main Exposures Parental  characteristics and obstetric complications. MAIN OUTCOME MEASURES: Rates of  autism and autism spectrum disorders. RESULTS: Seven epidemiological studies were  identified that fulfilled inclusion criteria. The parental characteristics  associated with an increased risk of autism and autism spectrum disorders  included advanced maternal age, advanced paternal age, and maternal place of  birth outside Europe or North America. The obstetric conditions that emerged as  significant fell into 2 categories: (1) birth weight and duration of gestation  and (2) intrapartum hypoxia. CONCLUSIONS: Evidence to suggest that parental age  and obstetric conditions are associated with an increased risk of autism and  autism spectrum disorders is accumulating. Although not proven as independent  risk factors for autism, these variables should be examined in future studies  that use large, population-based birth cohorts with precise assessments of  exposures and potential confounders.|*Maternal Age[MESH]|*Pregnancy Complications[MESH]|Autistic Disorder/*etiology[MESH]|Emigration and Immigration[MESH]|Female[MESH]|Fetal Hypoxia[MESH]|Gestational Age[MESH]|Humans[MESH]|Pregnancy[MESH]|Risk Factors[MESH] |