In a case controlled study. It is found that the disease is more common in the group taking coffee as compared to the control group. The significance of this is-: (A) Cause and effect relationship established, (B) Disease median can be calculated, (C) Caffeine is associated with occurrence of disease, (D) Controls will not get the disease
Answer is C. Case-control studies basically comparison study. Cases and control must be comparable with respect to known "confounding factor "such as age , sex occupation, social status, etc. The questions asked relate to personal characteristics and antecedent exposures which may be responsible for the condition studied.