Fig. 3.

Registration of pregnant women in Fukushima Prefecture for the JECS

The number of participants (right vertical axis) indicates the number of pregnant women registered each month for the JECS. The recruitment of subjects began on January 31, 2011. Soon after the start of recruitment, the Tohoku Region was hit by the Great East Japan Earthquake, followed by the TEPCO Fukushima Daiichi NPP accident. On October 1, 2012, the study area was expanded from 10 to 59 local municipalities covering the entire Fukushima Prefecture. Participation rate (left vertical axis) is the number of participating pregnant women divided by the total number of pregnant women who were provided with an oral explanation of this study.