Stable Iodine Intake and Thyroid Screening Outcomes After the Fukushima Nuclear Disaster: An Observational Study

Area of Science:

• Nuclear Medicine
• Pediatric Endocrinology
• Radiological Health

Background:

• Stable iodine is vital for preventing thyroid cancer post-radiological emergencies.
• The impact of stable iodine on children's thyroid health after the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident requires further investigation.

Purpose of the Study:

• To evaluate thyroid screening results in children following the FDNPP accident.
• To determine the association between stable iodine intake and thyroid outcomes in this pediatric cohort.

Main Methods:

• Observational study utilizing data from Fukushima's regional thyroid screening program.
• Analysis of 1974 children born between 1998-2011 in Miharu Town, with logistic regression and coarsened exact matching.
• Examined association between stable iodine intake and thyroid ultrasound findings.

Main Results:

• 55.5% of participants consumed stable iodine; 44.5% did not.
• No significant association found between stable iodine intake and thyroid screening outcomes requiring detailed examination (OR: 0.839; 95% CI: 0.393-1.8).
• Thyroid volume and parenchymal heterogeneity were comparable between intake and non-intake groups.

Conclusions:

• Stable iodine intake showed no association with thyroid ultrasound screening results in Fukushima children.
• Minimal adverse effects from single-dose stable iodine administration are supported.
• Low radiation doses post-FDNPP accident may explain the lack of observed association.