title: Mother's age at menarche and offspring size.
abstract: OBJECTIVE
  An individual's growth trajectory is, at least in part, inherited. Mother's early age at menarche has been associated with taller offspring height and greater body mass index (BMI) at age 9 years, suggesting that mother's age at menarche may be an intergenerational marker of growth. We examined the association between mother's age at menarche and childhood size at birth, and at ages 1, 3, 4, 7 and 8 years in the Collaborative Perinatal Project.
  
  
  METHODS
  We examined 128,636 measurements obtained from 31,474 Black and White children. We transformed the original measurements into z-scores. Child size was examined in mixed models, adjusted for center, child sex, race, socioeconomic index, child's exact age at measurement (in months), mother's age at recruitment and, depending on which measure was the outcome in the specific model, mother's height, pre-pregnancy weight or BMI.
  
  
  RESULTS
  Compared with children whose mother had menarche at age 15 years or later, children whose mothers had age at menarche before age 12 years were taller from 1 year of age and had higher BMI, particularly at ages 7 and 8 years (0.17 and 0.19 z-score units, respectively).
  
  
  CONCLUSIONS
  Mothers' age at menarche is a modest predictor of their children's growth trajectory. The mechanism is likely to be heritable, although other explanations are possible.
authors.affiliation: Epidemiology Branch, National Institute of Environmental Health Sciences NIH, DHHS, Durham, NC, USA. olga.basso@mcgill.ca
authors.forename: O
authors.initials: O
authors.lastname: Basso
authors.forename: M L
authors.initials: ML
authors.lastname: Pennell
authors.forename: A
authors.initials: A
authors.lastname: Chen
authors.forename: M P
authors.initials: MP
authors.lastname: Longnecker
mesh_terms: D000367:Age Factors; D017668:Age of Onset; D001724:Birth Weight; D001827:Body Height; D015992:Body Mass Index; D001835:Body Weight; D002648:Child; D002657:Child Development / Q000502:physiology*; D005260:Female; D006801:Humans; D008572:Menarche / Q000502:physiology*; D009035:Mothers; D011237:Predictive Value of Tests; D011247:Pregnancy