OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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What is the effectiveness range of a diaphragm?

85-90% effective
92-96% effective
98% effective
99% effective

The correct answer is: 92-96% effective

The diaphragm is a form of barrier contraception that is used to prevent pregnancy. When used correctly, it can be quite effective at preventing sperm from entering the uterus. The range of effectiveness for the diaphragm typically falls between 92-96%, which indicates that in typical use, about 92 to 96 women out of 100 will not become pregnant during the first year of use. This effectiveness rate takes into account factors such as proper placement and consistent use, as these can significantly influence its performance. If used perfectly—meaning consistently and correctly every time during intercourse—the effectiveness may increase, but the general recommended effectiveness range is what is usually highlighted in educational contexts.