在糖尿病的病因研究中，选择100名糖尿病病人，同时选择200名在年龄、性别、职业和受教育程度方面相似的非糖尿病病人，然后比较两组肥胖的比例。这是一种（）

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50/450×100/100=11.11% 200/450×100/100=44.44% 450/500×100/100=90% 400/550×100/100=81.82% 450/650×100/100=53.85%

300/350×100/100=85.71％ 200/450×100/100=44.44％ 450/500×100/100=90％ 200/500×100/100=40％ 300/500×100/100=60％

50/450x100/100=11.11% 200/450x100/100=44.44% 450/500x100/100=90% 400/550x100/100=81.82% 450/650x100/100=53.85%

300/350x100/100=85.71% 200/450x100/100=44.44% 450/500x100/100=90% 200/500x100/100=40% 300/500x100/100=60%

300／350x100／100=85.71% 200／450x100／100=44.44% 450／500x100／100=90% 200／500x100／100=40% 300／500x100／100=60%

300/450×100/1000=66.67% 200/450×100/100=44.44% 450/500×100/100=90% 200/500×100/100=40% 300/500×100/100=60%

50/450×100/100=11.11% 200/450×100/100=44.44% 450/500×100/10=90% 400/550×100/100=81.82% 350/650×100/100=53.85%

1.6 2.5 2.0 3.9 0.625

200/500×100/100=40％ 300/500×100/100=60％ 50/500×100/100=10％ 450/500×100/100=90％ 100/500×100/100=20％

50／450x100／100=11.11% 200／450x100／100=44.44% 450／500x100／100=90% 400／550x100／100=81.82% 450／650x100／100=53.85%

200/500x100/100=40% 300/500x100/100=60% 50/500x100/100=10% 450/500x100/100=90% 100/500x100/100=20%

10/10500 10/10000 10/140 10/130 10/40

现况调查临床试验横断面调查病例对照研究队列研究

200/500×100/100=40% 300/500×100/100=60% 50/500×100/100=10% 450/500×100/100=90% 100/500×100/100=20%

200／500x100／100=40% 300／500x100／100=60% 50／500x100／100=10% 450／500x100／100=90% 100／500x100／100=20%

50/450×100/100=11.11％ 200/450×100/100=44.44％ 450/500×100/100=90％ 400/550×100/100=81.82％ 450/650×100/100=53.85％

病例对照研究回顾性队列研究前瞻性队列研究生态学研究实验性研究

300/350×100/100=85.71% 200/450×100/100=44.44% 450/500×100/100=90% 200/500×100/100=40% 300/500×100/100=60%

200/500×100/100＝40% 300/500×100/100=60% 50/500×100/1000＝10% 450/500×100/100＝90% 100/500×100/100=20%