title: Variables predicting low infant developmental scores: maternal age above 30 years is a main predictor.
abstract: OBJECTIVE
  To explore variables predicting low developmental scores in 6-month-old infants in a population-based study.
  
  
  METHODS
  In a longitudinal study representative of pregnant women in Oslo, Norway, questionnaires were answered at 17 and 30 weeks of pregnancy and 6 months after term; N = 1053 after exclusions (women with non-Scandinavian ethnicity, twin births, infants <5.0 or >7.0 months corrected age, and birth weight <2.5 kg), and data were collected from the Norwegian Birth Registry. Measures included sociodemographic variables, maternal mental health and pregnancy life style, data concerning the birth/newborn, and the Ages and Stages Questionnaires (ASQ) for 6-month-olds. Logistic regression analyses were used to identify variables predicting an ASQ score ≤ 15 th percentile.
  
  
  RESULTS
  In adjusted analyses, only increasing maternal age and infant having older siblings predicted a low score on ASQ Total. These variables also predicted low scores on several ASQ areas (i.e. Communication, Gross motor, Fine motor, Problem-solving and Personal social), together with maternal major lifetime depression and feeling lonely. Protective variables were increasing infant birth weight (Gross motor) and pregnancy smoking (Communication). Other maternal sociodemographic variables, and infant sex, had no predictive power. Already at a maternal age of 31, the mean age of the pregnant women, the possibility of a low infant score increased significantly.
  
  
  CONCLUSIONS
  In this population-based study, higher maternal age, having older siblings, and a history of maternal major lifetime depression, mainly predicts low developmental scores in 6-month-old infants.
authors.affiliation: Institute of Clinical Medicine, University of Oslo, Olso, Norway and Child and Adolescent Mental Health Research Unit, Oslo University Hospital, Oslo, Norway.
authors.forename: Astrid
authors.initials: A
authors.lastname: Alvik
mesh_terms: D000328:Adult; D000367:Age Factors; D003865:Major Depressive Disorder / Q000453:epidemiology; D002658:Developmental Disabilities / Q000453:epidemiology*; D005191:Family Characteristics; D005260:Female; D006801:Humans; D007223:Infant; D008137:Longitudinal Studies; D008297:Male; D008423:Maternal Age; D009664:Norway / Q000453:epidemiology; D011247:Pregnancy; D012307:Risk Factors; D011795:Surveys and Questionnaires
keywords: Ages and Stages Questionnaires; child development; infant; infant behavior; maternal age; siblings