[Potential interaction effect on attention-deficit/hyperactivity disorder between mother's educational level and preschoolers' dietary pattern].

To explore the interaction effect between mother's educational level and preschoolers' dietary pattern on attention-deficit/hyperactivity disorder (ADHD). In 2014, there were 16 439 children aged 3-6 years old from 91 kindergartens in Ma'anshan municipality of China. A semi-quantitative food frequency questionnaire and the 10-item Chinese version of the Conners' Abbreviated Symptom Questionnaire (C-ASQ) were administered to assess the usual dietary intake and symptoms on ADHD.

[Epidemiological characteristics and relevant factors on the comorbidity of hyperactivity behavior and allergic diseases in preschool children].

To understand the epidemiological characteristics and relevant factors on the comorbidity of hyperactivity behavior and allergic disease among preschool children in urban areas of Ma'anshan city. During April 2014 to April 2015, 91 kindergartens over 3 years old were investigated. In the investigation, 16 439 questionnaires were distributed to parents, and 15 291 valid questionnaires were collected.

[Association between folic acid supplement in peri-conceptional period and depression in pregnancy: a cohort study].

Objective: To describe the epidemiological characteristics on the supplement of folic acid in progestation and early pregnancy, and to probe the protective effects of supplement of folic acid in early pregnancy against pregnant depression, in Ma'anshan city, Anhui province.

Methods: In this cohort study, 5 150 subjects who had their first antenatal examination at Ma'anshan Maternal and Child Care Centers were recruited under informed consent, from October 2008 to October 2010. All the information were collected through questionnaires in the first, second and third trimesters respectively.

[Causation between occupational prolonged standing time during progestation and pregnancy related complications].

Objective: To describe the epidemiological characteristics of profession related long-standing behavior during preconception and progestation, and to probe the relationship between prolonged standing jobs and the common pregnancy related complications among pregnant women, in Ma' anshan city,Anhui province.

Methods: In this cohort study, subjects who had their first antenatal examination at Ma' anshan Maternal and Child Care Centers were recruited under informed consent, from October 2008 to October 2010. All the information were collected through questionnaires in the first, second and third trimesters respectively.