PRN Graph4.1

The Perined-Hoftiezer birth weight curves show the optimal birth weight (and its distribution) of children born at the corresponding gestational age. The curves are differentiated by gender. Identifying small children is important for reducing mortality and morbidity.

These curves are based on data from the perinatal registration of newborns in the Netherlands. The curves are normative and therefore developed based on a low-risk population without known risk factors for fetal growth restriction. All multiple pregnancies, inductions, and primary cesarean sections were also excluded to approximate the optimal birth weight for each gestational age. More information can be found at www.perined.nl and in the following scientific publications:

Hoftiezer L et al. Am J Obstet Gynecol. (2019) From population reference to national standard: new and improved birthweight charts. 10.1016/j.ajog.2018.12.023

Hoftiezer L et al. Eur J Pediatr. (2016) Defining small-for-gestational-age: prescriptive versus descriptive birthweight standards. 10.1007/s00431-016-2740-8

The curves were compiled by Liset Hoftiezer, guided by a working group consisting of representatives from various professional groups, birth care organizations, and researchers:

Joyce Dijs-Elsinga, Jeroen van Dillen, Michel Hof, Marije Hogeveen, Chantal Hukkelhoven, Karline van de Kamp, Richard van Lingen, Alieke de Roon-Immerzeel, Rosalinde Snijders, Viki Verfaille, Ger de Winter, and Koos Zwinderman. The research position was financially supported by the Isala Innovation & Science Fund and Nutricia Early Life Nutrition; there has been no interference with the content of the project.

(c) 2024 Perined

Version History Bugfixes 4.1 03/18/2025 - The app remembers the last information you entered (gender, birth weight, gestational age)
- The curve is showing the point with the p-value
- Highlight a row and column in the table for easy reading
- Improved accessibility 4.0 02/18/2025 Small bugfixes 3.0.4 08/15/2023 * Weight up to 5500 grams now possible to enter
* Small textual changes 3.0.3 02/07/2018 * Made some textual changes in the app
* And updated the App Store description to reflect the new version 3.0 3.0.2 11/22/2017 We have completely updated the app on a number of important things. The data in the app has been revised based on new insights. Next to that the interface has been redone after feedback from our users. 3.01 11/04/2017 We have completely updated the app on a number of important things. The data in the app has been revised based on new insights. Next to that the interface has been redone after feedback from our users. 3.00 11/02/2017 Small fix to make sure the data in the portrait mode is correct at all times. 2.01 09/30/2016 After the merger of the perinatal registry and perinatal audit in the Netherlands, Perined was created. Because of this merger the app is being transformed to reflect those changes. The internal workings of the app has also be changed in this version. 2.00 03/04/2016 Fixed several bugs. 1.04 07/29/2014 Fixed a couple of bugs 1.03 04/18/2014 Added information on the options, so it will be more clear what and how to use the App. 1.02 04/08/2014 Small bug fix for week choices. 1.01 04/02/2014 1.0 03/27/2014