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Measured weight in early pregnancy is a valid method for estimating pre-pregnancy weight

Measured weight in early pregnancy is a valid method for estimating pre-pregnancy weight
Measured weight in early pregnancy is a valid method for estimating pre-pregnancy weight
Estimation of pre-pregnancy weight is difficult because measurements taken before pregnancy are rarely available. No studies have compared various ‘proxy’ measures using recalled weight or based on early pregnancy weight with actual measurements of pre-pregnancy weight. The Southampton Women’s Survey recruited women during 1998–2002 who were not pregnant. Data on 198 women with an estimated date of conception within 3 months of recruitment were analysed. Three proxy measures were considered: (1) recalled pre-pregnancy weight obtained during early pregnancy, (2) measured weight in early pregnancy and (3) estimated pre-pregnancy weight using a published model. Mean (standard deviation) recalled weight was 1.65 (3.03) kg lighter than measured pre-pregnancy weight, while early pregnancy weight and weights from the published model were 0.88 (2.34) and 0.88 (2.33) kg heavier, respectively. The Bland–Altman limits of agreement for recalled weight were −7.59 to 4.29 kg, wider than those for the early pregnancy weight: −3.71 to 5.47 kg and the published model: −3.68 to 5.45 kg. For estimating pre-pregnancy weight, we recommend subtraction of 0.88 kg from early pregnancy weight or the published model, or addition of 1.65 kg to recalled weight. Estimates of pre-pregnancy body mass index and gestational weight gain categories were very similar when using early pregnancy and published model weights, but they differed from those using recalled weight. Our findings indicate that calculations of first trimester weight gain using recalled weight must be treated cautiously, and a measured weight in early pregnancy provides a more precise assessment of pre-pregnancy weight than recalled weight.
Inskip, Hazel
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Crozier, Sarah
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Baird, Janis
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Hammond, Julia
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Robinson, Sian
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Cooper, Cyrus
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Godfrey, Keith
0931701e-fe2c-44b5-8f0d-ec5c7477a6fd
SWS Study Group
Inskip, Hazel
5fb4470a-9379-49b2-a533-9da8e61058b7
Crozier, Sarah
9c3595ce-45b0-44fa-8c4c-4c555e628a03
Baird, Janis
f4bf2039-6118-436f-ab69-df8b4d17f824
Hammond, Julia
4eb0a477-0336-41cc-830d-fca3a86a36e4
Robinson, Sian
6ada395c-a5e4-484b-b3a8-6760db7a48e4
Cooper, Cyrus
e05f5612-b493-4273-9b71-9e0ce32bdad6
Godfrey, Keith
0931701e-fe2c-44b5-8f0d-ec5c7477a6fd

Inskip, Hazel, Crozier, Sarah, Baird, Janis, Hammond, Julia, Robinson, Sian, Cooper, Cyrus and Godfrey, Keith , SWS Study Group (2020) Measured weight in early pregnancy is a valid method for estimating pre-pregnancy weight. Journal of the Developmental Origins of Health and Disease. (doi:10.1017/S2040174420000926).

Record type: Article

Abstract

Estimation of pre-pregnancy weight is difficult because measurements taken before pregnancy are rarely available. No studies have compared various ‘proxy’ measures using recalled weight or based on early pregnancy weight with actual measurements of pre-pregnancy weight. The Southampton Women’s Survey recruited women during 1998–2002 who were not pregnant. Data on 198 women with an estimated date of conception within 3 months of recruitment were analysed. Three proxy measures were considered: (1) recalled pre-pregnancy weight obtained during early pregnancy, (2) measured weight in early pregnancy and (3) estimated pre-pregnancy weight using a published model. Mean (standard deviation) recalled weight was 1.65 (3.03) kg lighter than measured pre-pregnancy weight, while early pregnancy weight and weights from the published model were 0.88 (2.34) and 0.88 (2.33) kg heavier, respectively. The Bland–Altman limits of agreement for recalled weight were −7.59 to 4.29 kg, wider than those for the early pregnancy weight: −3.71 to 5.47 kg and the published model: −3.68 to 5.45 kg. For estimating pre-pregnancy weight, we recommend subtraction of 0.88 kg from early pregnancy weight or the published model, or addition of 1.65 kg to recalled weight. Estimates of pre-pregnancy body mass index and gestational weight gain categories were very similar when using early pregnancy and published model weights, but they differed from those using recalled weight. Our findings indicate that calculations of first trimester weight gain using recalled weight must be treated cautiously, and a measured weight in early pregnancy provides a more precise assessment of pre-pregnancy weight than recalled weight.

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Revised version 2 - Pre-preg-weight-assessment-JDOHaD 200824-clean - Accepted Manuscript
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Accepted/In Press date: 1 September 2020
e-pub ahead of print date: 13 October 2020

Identifiers

Local EPrints ID: 443814
URI: http://eprints.soton.ac.uk/id/eprint/443814
PURE UUID: 4a00b2f1-630b-4085-8ca8-b31952f81c60
ORCID for Hazel Inskip: ORCID iD orcid.org/0000-0001-8897-1749
ORCID for Sarah Crozier: ORCID iD orcid.org/0000-0002-9524-1127
ORCID for Janis Baird: ORCID iD orcid.org/0000-0002-4039-4361
ORCID for Cyrus Cooper: ORCID iD orcid.org/0000-0003-3510-0709
ORCID for Keith Godfrey: ORCID iD orcid.org/0000-0002-4643-0618

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Date deposited: 14 Sep 2020 16:31
Last modified: 26 Nov 2021 02:46

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Contributors

Author: Hazel Inskip ORCID iD
Author: Sarah Crozier ORCID iD
Author: Janis Baird ORCID iD
Author: Julia Hammond
Author: Sian Robinson
Author: Cyrus Cooper ORCID iD
Author: Keith Godfrey ORCID iD
Corporate Author: SWS Study Group

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