自70年代初以来一直担忧口服避孕药(OCs)使用会引起中风的危险性。随着新的低剂量OCs的出现,人们所预料过高的危险性已经变小了,WHO从大量高剂量和低剂量两种COs对出血性和脑血栓中风病例对照多中心研究中发表了研究结果。加利福尼亚的凯撒常设医学规划处发表了新的结果。WHO研究样本很大,包括2 000多例中风病例和6 000例住院病例作对照。加利福尼亚的研究较小(408例中风病人),使用人口基 The use of oral contraceptives (OCs) has been at risk for stroke since the early 1970s. With the advent of new low-dose OCs, the risks that people have predicted are too high, the WHO published a large number of high and low doses of COs in hemorrhagic and cerebral thrombotic stroke multicenter case-control studies published result. The Caesar Permanent Medical Planning Unit in California published new results. The WHO study sample is very large, including more than 2,000 stroke cases and 6,000 hospitalized cases as controls. A smaller study in California (408 stroke patients) uses a population base