The Japan Environment and Children's Study (JECS): A Preliminary Report on Selected Characteristics of Approximately 10 000 Pregnant Women Recruited During the First Year of the Study.
BACKGROUND
The Japan Environment and Children's Study (JECS) is an ongoing nationwide birth cohort study launched in January 2011. In this progress report, we present data collected in the first year to summarize selected maternal and infant characteristics.


METHODS
In the 15 Regional Centers located throughout Japan, the expectant mothers were recruited in early pregnancy at obstetric facilities and/or at local government offices issuing pregnancy journals. Self-administered questionnaires were distributed to the women during their first trimester and then again during the second or third trimester to obtain information on demographic factors, physical and mental health, lifestyle, occupation, environmental exposure, dwelling conditions, and socioeconomic status. Information was obtained from medical records in the first trimester and after delivery on medical history, including gravidity and related complications, parity, maternal anthropometry, and infant physical examinations.


RESULTS
We collected data on a total of 9819 expectant mothers (mean age = 31.0 years) who gave birth during 2011. There were 9635 live births. The selected infant characteristics (singleton births, gestational age at birth, sex, birth weight) in the JECS population were similar to those in national survey data on the Japanese general population.


CONCLUSIONS
Our final birth data will eventually be used to evaluate the national representativeness of the JECS population. We hope the JECS will provide valuable information on the impact of the environment in which our children live on their health and development.
National Center for the Japan Environment and Children's Study, National Institute for Environmental Studies.
Takehiro
T
Michikawa
Hiroshi
H
Nitta
Shoji F
SF
Nakayama
Masaji
M
Ono
Junzo
J
Yonemoto
Kenji
K
Tamura
Eiko
E
Suda
Hiroyasu
H
Ito
Ayano
A
Takeuchi
Toshihiro
T
Kawamoto
D000328:Adult; D015331:Cohort Studies; D000013:Congenital Abnormalities / Q000453:epidemiology* / Q000209:etiology; D004781:Environmental Exposure / Q000009:adverse effects; D004782:Environmental Health; D004785:Environmental Pollutants / Q000633:toxicity*; D005260:Female; D006801:Humans; D007229:Infant Welfare; D007231:Infant, Newborn; D007564:Japan / Q000453:epidemiology; D008297:Male; D018811:Maternal Exposure / Q000009:adverse effects; D011247:Pregnancy; D055815:Young Adult
D004785:Environmental Pollutants