BACKGROUND AND OBJECTIVES: Birth size curves are needed for clinical and epidemiological purposes. We constructed birth weight (BW), length (BL), and head circumference (BHC) references, assessed effects of twinness and parity, and defined cut-off points for small, appropriate, and large for gestational age. MATERIALS AND METHODS: Birth register data of all 753,036 infants born in 1996-2008 in Finland were cleaned to create references reflecting optimal intrauterine growth. The final data included 533,666 singletons and 15,033 twins (median gestation weeks (gws) 40.0 and 37.1, respectively, 41.6% primiparous). Sex-specific BW, BL, and BHC references were constructed from 23 to 43 gws separately for singletons and twins born to primiparous or multiparous mothers. GAMLSS method was used for modelling. RESULTS: In singletons from 36 gws onwards, increased BW and BL were observed in comparison to previous reference from 1979-1983. Twins diverged from singletons from 30 gws onwards. At 37.0 gws, mean BW was 400 g lower and mean BL 1.2 cm shorter than in singletons. From 30 gws onwards, birth size was larger in infants of multiparous than primiparous mothers. CONCLUSIONS: Population-based birth size references are available for the evaluation of birth size. Accounting for plurality and parity improves the accuracy of birth size evaluation.
BACKGROUND AND OBJECTIVES: Birth size curves are needed for clinical and epidemiological purposes. We constructed birth weight (BW), length (BL), and head circumference (BHC) references, assessed effects of twinness and parity, and defined cut-off points for small, appropriate, and large for gestational age. MATERIALS AND METHODS: Birth register data of all 753,036 infants born in 1996-2008 in Finland were cleaned to create references reflecting optimal intrauterine growth. The final data included 533,666 singletons and 15,033 twins (median gestation weeks (gws) 40.0 and 37.1, respectively, 41.6% primiparous). Sex-specific BW, BL, and BHC references were constructed from 23 to 43 gws separately for singletons and twins born to primiparous or multiparous mothers. GAMLSS method was used for modelling. RESULTS: In singletons from 36 gws onwards, increased BW and BL were observed in comparison to previous reference from 1979-1983. Twins diverged from singletons from 30 gws onwards. At 37.0 gws, mean BW was 400 g lower and mean BL 1.2 cm shorter than in singletons. From 30 gws onwards, birth size was larger in infants of multiparous than primiparous mothers. CONCLUSIONS: Population-based birth size references are available for the evaluation of birth size. Accounting for plurality and parity improves the accuracy of birth size evaluation.
Authors: Laura Timonen-Soivio; Andre Sourander; Heli Malm; Susanna Hinkka-Yli-Salomäki; Mika Gissler; Alan Brown; Raija Vanhala Journal: J Autism Dev Disord Date: 2015-10
Authors: Hanna Lagström; Samuli Rautava; Helena Ollila; Anne Kaljonen; Olli Turta; Johanna Mäkelä; Chloe Yonemitsu; Julia Gupta; Lars Bode Journal: Am J Clin Nutr Date: 2020-04-01 Impact factor: 7.045
Authors: Minna Sucksdorff; Alan S Brown; Roshan Chudal; Heljä-Marja Surcel; Susanna Hinkka-Yli-Salomäki; Keely Cheslack-Postava; David Gyllenberg; Andre Sourander Journal: J Am Acad Child Adolesc Psychiatry Date: 2019-12-19 Impact factor: 8.829