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-X题卡

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%

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