BackgroundThe Japan Environment and Children’s Study (JECS), known as Ecochil-Chosa in Japan, is a nationwide birth cohort study investigating the environmental factors that might affect children’s health and development. We report the baseline profiles of the participating mothers, fathers, and their children.MethodsFifteen Regional Centres located throughout Japan were responsible for recruiting women in early pregnancy living in their respective recruitment areas. Self-administered questionnaires and medical records were used to obtain such information as demographic factors, lifestyle, socioeconomic status, environmental exposure, medical history, and delivery information. In the period up to delivery, we collected bio-specimens, including blood, urine, hair, and umbilical cord blood. Fathers were also recruited, when accessible, and asked to fill in a questionnaire and to provide blood samples.ResultsThe total number of pregnancies resulting in delivery was 100,778, of which 51,402 (51.0%) involved program participation by male partners. Discounting pregnancies by the same woman, the study included 95,248 unique mothers and 49,189 unique fathers. The 100,778 pregnancies involved a total of 101,779 fetuses and resulted in 100,148 live births. The coverage of children in 2013 (the number of live births registered in JECS divided by the number of all live births within the study areas) was approximately 45%. Nevertheless, the data on the characteristics of the mothers and children we studied showed marked similarity to those obtained from Japan’s 2013 Vital Statistics Survey.ConclusionsBetween 2011 and 2014, we established one of the largest birth cohorts in the world.

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BackgroundThis study assessed the psychometric profile of 10 questionnaires (every 6 months, from 6 to 60 months) from the Japanese translation of the Ages and Stages Questionnaires, third edition (J‐ASQ‐3).MethodsData from 439 children in a birth cohort were used to identify the J‐ASQ‐3 score distribution, establish cut‐off scores, and calculate the instrument's internal consistency. Data were also collected from 491 outpatients to examine J‐ASQ‐3 test–retest reliability and concurrent validity, which was examined using the Kyoto Scale of Psychological Development (KSPD) and the Japanese version of the Denver Developmental Screening Test II (J‐Denver II). Both the original and the alternative screening criteria of the ASQ‐3 were used (failure in at least one and at least two domains, respectively).ResultsCronbach's alpha for each J‐ASQ‐3 subscale on each questionnaire ranged from 0.45 to 0.89. Test–retest reliability was >0.75 for the subscales on almost all questionnaires. Concurrent validity was also adequate. In comparison with the screening results of the KSPD, the overall sensitivity and specificity were 96.0% and 48.8%, respectively, when the ASQ‐3 original criterion was used, and 92.1% and 74.9%, respectively, when the alternative criterion was used. In comparison with the screening results of the J‐Denver II, the overall sensitivity and specificity were 75.6% and 74.7%, respectively, when the ASQ‐3 original criterion was used, and 56.3% and 93.0%, respectively, when the alternative criterion was used.ConclusionsThis study quantified the psychometric profiles of the Japanese translations of 10 ASQ‐3 questionnaires. We demonstrated the validity of the J‐ASQ‐3 and determined new cut‐off scores. Further studies with larger samples from a greater range of locations are required to clarify the suitability of this tool for all Japanese children.

Background: Reluctance of people to receive recommended vaccines is a growing concern as 2 distribution of vaccines is considered critical to ending the COVID-19 pandemic. There is little 3 information regarding pregnant women's views toward coronavirus vaccination in Japan.4 Therefore, we investigated the vaccination rate and reasons for vaccination and vaccine 5 hesitancy among pregnant women in Japan.6 Methods: We conducted a cross-sectional study involving 1,791 pregnant women using data 7 from the Japan "COVID-19 and Society" Internet Survey, conducted from July to August 2021, 8 and valid response from 1,621 respondents were analyzed. We defined participants with 9 vaccine hesitancy as those who identified with the statement "I do not want to be vaccinated" or "I want to 'wait and see' before getting vaccinated." Multivariate Poisson regression analysis was used to investigate the factors contributing to vaccine hesitancy. Results:The prevalence of vaccination and vaccine hesitancy among pregnant women was 13.4% (n=217) and 50.9% (n=825), respectively. The main reasons for hesitancy were concerns about adverse reactions and negative effects on the fetus and breastfeeding. The significant factor for vaccine hesitancy was the lack of trust in the government (adjusted PR, 1.26; 95% CI, 1.03-1.54). Other factors such as age, educational attainment, state of emergency declaration were not associated with vaccine hesitancy.Conclusions: COVID-19 vaccination is not widespread among pregnant women in Japan although many vaccines have been shown to be safe in pregnancy. Accurate information dissemination and boosting trust in the government may be important to address vaccine hesitancy among pregnant women.

Neonicotinoids, a widely used group of pesticides designed to selectively bind to insect nicotinic acetylcholine receptors, were considered relatively safe for mammalian species. However, they have been found to activate vertebrate nicotinic acetylcholine receptors and could be toxic to the mammalian brain. In the present study, we evaluated the developmental neurotoxicity of acetamiprid (ACE), one of the most widely used neonicotinoids, in C57BL/6J mice whose mothers were administered ACE via gavage at doses of either 0 mg/kg (control group), 1.0 mg/kg (low-dose group), or 10.0 mg/kg (high-dose group) from gestational day 6 to lactation day 21. The results of a battery of behavior tests for socio-sexual and anxiety-related behaviors, the numbers of vasopressin-immunoreactive cells in the paraventricular nucleus of the hypothalamus, and testosterone levels were used as endpoints. In addition, behavioral flexibility in mice was assessed in a group-housed environment using the IntelliCage, a fully automated mouse behavioral analysis system. In adult male mice exposed to ACE at both low and high doses, a significant reduction of anxiety level was found in the light-dark transition test. Males in the low-dose group also showed a significant increase in sexual and aggressive behaviors. In contrast, neither the anxiety levels nor the sexual behaviors of females were altered. No reductions in the testosterone level, the number of vasopressin-immunoreactive cells, or behavioral flexibility were detected in either sex. These results suggest the possibility that in utero and lactational ACE exposure interferes with the development of the neural circuits required for executing socio-sexual and anxiety-related behaviors in male mice specifically.