advanced maternal age的用法和样例：
- This study offers useful information to nurses caring for women of advanced maternal age and amniocentesis.
- This study explores the experienced of advanced maternal age from being informed amniocentesis to actual implement.
- Results: Of 15 patients, 9 (60%) were with advanced maternal age, 8 (53%) were primipara, and 9 (60%) attacked during the third trimester.
- The growing birth weight of newborn and advancing maternal age were also the influencing factors to elevate cesarean section rate.