Translation and validation of the Japanese version of the Birth Satisfaction Scale-Revised.

AIM: This study aimed to develop a Japanese version of the Birth Satisfaction Scale-Revised and evaluate its reliability and validity. METHODS: After translating the Birth Satisfaction Scale-Revised into Japanese, we conducted an Internet-based cross-sectional study with 445 Japanese-speaking women within 2 months of childbirth. Of these, 98 participated in the retest 1 month later. Data were analyzed using the COSMIN study design checklist for patient-reported outcome measurement instruments. Content validity was evaluated through cognitive debriefing during the translation process into Japanese. Confirmatory factor analysis was conducted to verify structural and cross-cultural validities. For hypothesis testing, we tested correlations with existing measures for convergent and divergent validities, and for known-group discriminant validity, we made comparisons between types of childbirth. Internal consistency was calculated using Cronbach's α, and test-retest reliability was evaluated using the intraclass correlation coefficient. RESULTS: For the Japanese-Birth Satisfaction Scale-Revised, the established three-factor model fit poorly, whereas the four-factor model fit better. Full metric invariance was observed in both the nulliparous and multiparous groups. Good convergent, divergent, and known-group discriminant validities and test-retest reliability were established. Internal consistency observations were suboptimal; however for vaginal childbirth, the Cronbach's α of the total score was .71. CONCLUSIONS: The Japanese-Birth Satisfaction Scale-Revised is a valid and reliable scale, with the exception of internal consistency that requires further investigation. If limited to vaginal childbirth, research, clinical applications, and international comparisons can be drawn.

Rice (Oryza sativa L.) roots have iodate reduction activity in response to iodine.

Although iodine is not an essential nutrient for higher plants, their roots take up and transport the element. However, the exact mechanisms involved in iodine uptake and metabolism in higher plants have yet to be elucidated. In this study, we compared two cultivars differing in iodine tolerance ("Nipponbare" and "Gohyakumangoku") to increasing levels of I(-) and IO(-) 3 in the root solutions of water-cultured rice (Oryza sativa L.). We found that IO(-) 3 added to the root solutions was converted to I(-) in the presence of roots. Iodate reduction occurred over the course of several hours. Furthermore, the iodate reduction activity of "Nipponbare" (iodine-sensitive) and "Gohyakumangoku" (iodine-tolerant) roots increased after adding IO(-) 3 or I(-). The roots of barley and soybean also showed iodate reduction activity and the activity responded to iodine treatment either with IO(-) 3 and I(-). This study suggests that plant roots biologically reduce iodate to iodide and indicates that the iodate reduction activity of roots responds to external iodine conditions.