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Article

MoBa data research files

Version 12 of the MoBa data research file was made available to researchers in January 2019. In July 2020, the diet questionnaire for youths was added to version 12.

Version 12 of the MoBa data research file was made available to researchers in January 2019. In July 2020, the diet questionnaire for youths was added to version 12.


The table below shows the number of participant forms included in version 12 of the MoBa data research file.

For the questionnaires answered during pregnancy (Questionnaire 1-3, Father) the pregnancy is the unit. For all questionnaires answered by the mother after birth, the unit is the child.

In 2015-2016, a new questionnaire was sent to all fathers in MoBa. Part 1 of this questionnaire use father as unit, and part 2 use child as unit.

Table 1 - Summary of questionnaires in Version 12 (as of December 2022)
Questionnaires Version 12
Questionnaire 1 (pregnancy 17-20 weeks) 101753
Questionnaire 2 (C/D/W) (pregnancy diet) 87374
Questionnaire 3 (pregnancy 30 weeks) 93809
6 months questionnaire 89321
18 months questionnaire 76116
3 years questionnaire 58641
5 years questionnaire 41535
7 years questionnaire 54611
8 years questionnaire 43487
Diet youth questionnaire (13 years old) 1 43493
Questionnaire for youths (14 years old) 1 22096
Questionnaire for mothers (14 years old) 1 17566
MoBa Ung skjema 1 (16-17 år) 1 22714
MoBa Ung skjema 2 (16-17 år) 1 12979
Father’s questionnaire - total 76873
Father’s questionnaire - long version 34408
Father’s questionnaire no. – Part 1: About the father 29250
Father’s questionnaire no. – Part 2: About the child 34803
Questionnaire influenza child 15005
Questionnaire influenza mother 12261
Ultrasound form (pregnancy 17-20 weeks) 91255
Medical Birth Registry of Norway (MBRN) 2 113623

Ongoing data collection

2 Standard variables from the child’s birth record in Medical Birth Registry of Norway (MBRN) can be accessed with other data from MoBa without a separate application to MBRN.

Researchers may apply for access to and use of data from the MoBa cohort in their research. The application procedure describes how to apply for access to data in MoBa.

If you have received data from MoBa earlier and need updated data, please send your request to .

The pricelist give information on prices for access to data and updated data from MoBa.

Data based on free text

Occupational information from questionnaire 1 is coded for approximately 70 % of the participants. Occupational data is mainly available on an aggregate level. If more specific information is requested, a careful assessment of the overall data set must be performed to ensure the protection of participants’ identities and privacy.

Coding of medication is complete for all questionnaire forms included in version 12.

Data based on free text are not part of MoBa standard data and must be specified in the application when applying for data.