Strengths and limitations
The random comparison between the medical and age-related scenario is original and mitigates sources of response bias (e.g., order-effects, demand characteristics, social desirability, or fairness/reciprocity norms)No sampling strategy is free from bias, and this study may have selectively recruited women with strong positive or negative attitudes to OC. However, the large observed support for OC is validated by previous Swedish population-based findings