Data collection
We used seven types of data from the dataset released in March 2018
(jecs-an-20180131) that included information from questionnaires and
medical record transcripts. MT1 provided data from self-reported
questionnaires collected during the first trimester that included
information about maternal medical backgrounds. DrT1 provided medical
information collected from the medical record transcripts during the
first trimester provided by each co-operating health care provider. MT2
provided data from self-reported questionnaires collected during the
second/third trimester that included information on lifestyle and
socioeconomic status. Dr0m provided perinatal information collected from
the medical record transcripts provided by each co-operating health care
provider. M1m provided data from self-reported questionnaires collected
at one month after birth. C6m provided data from self-reported
questionnaires collected at six months after birth. C1Y provided data
from self-reported questionnaires collected at 12 months after birth.
We excluded women who miscarried,
had multiple births, whose babies were stillborn, or whose data
regarding confounders were missing (Fig. 1).