The effect is not limited to women who have oophorectomy performed before menopause; an impact on survival is expected even for surgeries performed up to the age of 65.[20] Surgery at age 50-54 reduces the probability of survival until age 80 by 8% (from 62% to 54% survival), surgery at age 55-59 by 4%. Most of this effect is due to excess cardiovascular risk and hip fractures.[20]