What type of research study design is each of the following? And why

1.pdf

1. Clinically, radiologically, and electromyographic features in 6 children with joint

contractures (arthrogryposis) associated with congenital infection presumably caused by

rift valley virus was examined .

2. One hundred cases with new diagnosed cancer of oropharyngeal cancer and two hundred

normal patients without cancer to evaluate associations between human pox infection and

oropharyngeal cancer. Multivariate logistic-regression models were used.

3. 1.1 million French women recruited into the Million Women Study, aged 40-64 during

1995-2000, and followed up, on average, for 5.1 years for HIV incidence and 8.0 years for

cancer mortality.

4. 500 women recently diagnosed with lung cancer and 500 women without lung cancer are

interviewed about their diet and lifestyle

5. All members of a particular health fund are sent a questionnaire asking about their quality

of life over the past 4 weeks.

6. The rates of cancer in 50 countries worldwide are compared with their rates of obesity to

see if countries with higher levels of obesity also have higher cancer rates.