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. 2018 Feb 5;47(2):417–426. doi: 10.1093/ije/dyx266

Figure 1.

Figure 1

Formation of the analysis sample. (a) The Norwegian Mother and Child Cohort Study (MoBa). (b) The Danish National Birth Cohort (DNBC). In MoBa, a total of 2545 children were excluded because they were stillborn, abortions or had unknown birth outcome, and 3842 live-born children were excluded because they were from multiple births. In DNBC, a total of 6303 children were excluded because they were stillborn, abortions or had unknown birth outcome, and 4163 live-born children were excluded because they were from multiple births.