Differences and Correlation Analysis of Birth Weight and Overweight/Obesity in Shanghai Twin Cohort.

The objective of this study was to analyze differences in birth weight and overweight/obesity in a Shanghai twin cohort. We also wanted to study their association and explore possible risk factors for the discordance of overweight/obesity within twins. This was an internal case-control study designed for twins.

Association of birth defects with the mode of assisted reproductive technology in a Chinese data-linkage cohort.

Objective: To evaluate the impact of assisted reproductive technology (ART) on the offspring of Chinese population.

Design: Retrospective, data-linkage cohort.

Setting: Not applicable.