Purchase one-time access:Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online access
One-time access price info
- For academic or personal research use, select 'Academic and Personal'
- For corporate R&D use, select 'Corporate R&D Professionals'
Subscribe:Subscribe to Journal of Obstetrics and Gynaecology Canada
- The research implications of the selection of a gestational age estimation method.Paediatr Perinat Epidemiol. 2007; 21: 86-96
- Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination.Am J Obstet Gynecol. 2002; 187: 1660-1666
- A comparison of recalled date of last menstrual period with prospectively recorded dates.J Womens Health (Larchmt). 2005; 14: 248-252
- Methods for Estimating the Due Date.Obstet Gynecol. 2017; 129: e150-e154
- Accuracy of serum beta-human chorionic gonadotropin cutoff values at 42 and 49 days' gestation.Am J Obstet Gynecol. 2001; 185: 966-969
- Human chorionic gonadotropin as a measure of pregnancy duration.Int J Gynaecol Obstet. 2013; 123: 189-195
- Stopping the misinformation: BNT162b2 COVID-19 vaccine has no negative effect on women’s fertility.medRxiv. 2021; (05.30.21258079): 2021
- Severe Acute Respiratory Syndrome Coronavirus 2 and Pregnancy Outcomes According to Gestational Age at Time of Infection.Emerging infectious diseases. 2021; 27
- Differences in Serum Human Chorionic Gonadotropin Rise in Early Pregnancy by Race and Value at Presentation.Obstet Gynecol. 2016; 128: 504-511
- Reference ranges and determinants of total hCG levels during pregnancy: the Generation R Study.Eur J Epidemiol. 2015; 30: 1057-1066
- Common misconceptions about validation studies.Int J Epidemiol. 2020; 49: 1392-1396
Publication stageIn Press Journal Pre-Proof
Enter 3–6 MeSH subject headings that represent the topics covered in this manuscript
List all author disclosures, including all funding sources (as documented on the COI forms you submitted), or the statement “The authors declare they have nothing to disclose.”
The authors declare they have nothing to disclose
Enter the Research Ethics Board approval board name and approval number below or a statement of exemption, if REB approval was not required.
The Queen's University Health Sciences & Affiliated Teaching Hospitals Research Ethics Board approved the study (6035318)
Enter a statement of acknowledgements below, if applicable.
This study received funding from the Canadian Institutes of Health Research (CIHR), grant number WI3 179960. This study was also supported by ICES, which is funded by an annual grant from the Ontario Ministry of Health (MOH) and the Ministry of Long-Term Care (MLTC). This document used data adapted from the Statistics Canada Postal CodeOM Conversion File, which is based on data licensed from Canada Post Corporation, and/or data adapted from the Ontario Ministry of Health Postal Code Conversion File, which contains data copied under license from ©Canada Post Corporation and Statistics Canada. Parts of this material are based on data and/or information compiled and provided by CIHI and OLIS. The analyses, conclusions, opinions and statements expressed herein are solely those of the authors and do not reflect those of the funding or data sources; no endorsement is intended or should be inferred. This study is based, in part, on data provided by the Better Outcomes Registry & Network (BORN), part of the Children’s Hospital of Eastern Ontario. The interpretation and conclusions contained herein do not necessarily represent those of BORN Ontario.
Enter below any other information the Editorial Office should know concerning the production of this article (e.g., other statements to include, including co–first authorship).
Data sharing: The data set from this study is held securely in coded form at ICES. While data-sharing agreements prohibit ICES from making the data set publically available, access may be granted to those who meet prespecified criteria for confidential access, available at www.ices.on.ca/DAS. The full data set creation plan and underlying analytic code are available from the authors upon request, understanding that the computer programmes may rely upon coding templates or macros that are unique to ICES and therefore either inaccessible or requiring modification.