Figure 1. Associations between disaster exposure and maternal characteristics. The association between disaster exposure and each maternal characteristic, such as pre-pregnancy body mass index (BMI) ≥25 kg/m2, smoking during the first trimester, score ≥5 on the Kessler Psychological Distress Scale-6 (K6) Psychological Distress Scale in the first trimester, household income <4 million JPY/year, and living with the parents in the first trimester as identified by multiple logistic regression analyses are shown. Multiple logistic regression analysis for the association between disaster exposure and pre-pregnancy BMI ≥25 kg/m2 was adjusted for smoking during the first trimester, K6 score ≥13 in the first trimester, household income <4 million JPY/year, and living with the parents in the first trimester. Smoking during the first trimester was adjusted for pre-pregnancy BMI ≥25 kg/m2, K6 score ≥13 in the first trimester, household income <4 million JPY/year, and living with the parents in the first trimester. K6 score ≥13 in the first trimester was adjusted for pre-pregnancy BMI ≥25 kg/m2, smoking during the first trimester, household income <4 million JPY/year, and living with the parents in the first trimester. Household income <4 million JPY/year was adjusted for pre-pregnancy BMI ≥25 kg/m2, smoking during the first trimester, K6 score ≥13 in the first trimester, and living with the parents in the first trimester. Living with the parents in the first trimester was adjusted for pre-pregnancy BMI ≥25 kg/m2, smoking during the first trimester, K6 score ≥13 in the first trimester, and household income <4 million JPY/year. Odds ratios and 95% confidence intervals were calculated for groups B and C, with group A as the reference value. P for trends of disaster exposure are shown for each maternal characteristic.
