Shanghai: More-than-adequate iodine intake in 48.8% of 8-10 yr old children - tied to lower exam scores
Posted: Sat Oct 18, 2025 10:05 am
Wang Z, Shao C, Zhu Y, Shi Z, Qu M, Song Q, Shen L, Mai S, Lu W, Sun Z, Xiang X, Zang J - "Iodine excess may lead to low exam score in children aged 8-10 years" Biological Trace Element Research 202(4):1468-1476 (2024) doi: 10.1007/s12011-023-03783-0
https://link.springer.com/article/10.10 ... 23-03783-0
https://link.springer.com/article/10.10 ... 23-03783-0
"The median UIC of 3213 children aged 8-10 years in Shanghai was 195.4 (122.0, 285.8) µg/L and exceeded 200 µg/L in 48.8% of the population...By correcting for potential confounding factors, logistic regression demonstrated that compared to the adequate iodine status group, students in the slight iodine excess group were less likely to get "A" (score > 90) in math, Chinese, and English exams (Math: OR = 0.775, 95% CI = 0.660-0.911, P = 0.002; Chinese: OR = 0.707, 95% CI = 0.543-0.842, P < 0.001; English: OR = 0.720, 95% CI = 0.610-0.849, P < 0.001). In Shanghai, the iodine status of 8-10-year-old children is approaching the upper limit of the adequate range. Iodine excess in Shanghai may lead to low exam scores for students."