A public health study followed users of two non-hormonal contraceptive methods for one year. The two groups had similar exposure to sexually transmitted infections (STIs).
| Method | Number of users | Number of users who became pregnant | Number of users who acquired an STI |
|---|---|---|---|
| Condom | 800 | 104 | 32 |
| Copper intrauterine device (IUD) | 1000 | 8 | 160 |
A researcher claimed that the copper IUD was better than condoms at preventing pregnancy and reducing the transmission of STIs.
Use the data and your knowledge of contraception to evaluate the researcher's claim.
85 exam-style questions on AQA GCSE Biology 5.3 Hormonal coordination in humans, covering 5.3.1 Human endocrine system, 5.3.2 Control of blood glucose concentration, 5.3.3 Maintaining water and nitrogen balance in the body, 5.3.4 Hormones in human reproduction, 5.3.5 Contraception, 5.3.6 The use of hormones to treat infertility (HT only), and 5.3.7 Negative feedback (HT only). Each one has a worked solution and a mark scheme showing where the marks go.