02-03-2014, 07:26 PM
A case-control study is conducted to assess the association b/w alcohol consumption and lung cancer. 100 patients with lung cancer and 100 controls are asked about their past alcohol consumption. According to the study result, alcohol consumption is strongly associated with lung cancer (odds ratio = 2.25). The researchers then divide the study group into two groups: smokers and non-smokers. Subsequent statistical analysis does not reveal any association b/w alcohol consumption and lung cancer within either group. The scenario described above is an example of which of the following ?
A- Observer bias
B- Effect modification
C- Placebo effect
D- Selective survival
E- Confounding
F- Nonrespons bias
A- Observer bias
B- Effect modification
C- Placebo effect
D- Selective survival
E- Confounding
F- Nonrespons bias
