Final answer:
The statement indicating understanding of diaphragm use is that it should remain in place for at least 6 hours after intercourse, and oil-based lubricants should be avoided as they can damage the diaphragm. Creams and jellies are recommended to increase its effectiveness, and replacement is generally needed every two years.
Step-by-step explanation:
The correct statement by the client that indicates an understanding of proper diaphragm use for contraception is: "I will leave the diaphragm in for at least 6 hours after vaginal intercourse." This is accurate because the diaphragm must remain in place for 6 to 8 hours after intercourse to effectively prevent pregnancy. Using additional spermicidal jelly is also recommended for subsequent intercourse within that time frame without disturbing the diaphragm. It is important not to use oil-based lubricants with a diaphragm as they can degrade the material. Furthermore, while using creams or jellies with a diaphragm is essential, it is not true that they should be avoided to ensure the diaphragm fits snugly; instead, they should be used to increase the effectiveness of the diaphragm in preventing pregnancy. Lastly, while annual check-ups are important, diaphragms typically need to be replaced every two years unless otherwise specified by a healthcare provider.