>>735 科学的論拠があるんだけど https://dual.nikkei.com/article/034/27/14_3427_03.gif Rothman, K. J. et al. Volitional determinants and age-related decline in fecundability: a general population prospective cohort study in Denmark. Fertil. Steril. 99, 1958?1964 (2013)