In Miharu, health care professionals distributed stable iodine to 3,134 households (94.9% distribution rate) after explosions at the Fukushima nuclear plant caused by the 2011 earthquake in eastern Japan, along with instructions provided by the local government. Screening and questionnaire records included age of participants at the time of the nuclear accident, sex, region of residence before the accident, whether the participant was evacuated, whether the child and parents took stable iodine orally after the accident and dietary habits, including iodine intake. Researchers used logistic regression models to identify factors associated with stable iodine intake.
Within the cohort, 610 children (63.5%) had taken stable iodine, according to questionnaire data.
Researchers found that children were more likely to take stable iodine provided after the accident if their parents took stable iodine (OR = 61; 95% CI, 37.9-102.9). Compared with preschool and school-aged children, infants (aged 2 years or younger) were less likely to take stable iodine (OR = 0.21; 95% CI, 0.11-0.36).