To examine the relationship between alcohol consumption and cancer of the oesophagus, feasible studies include: (a) questionnaire survey of a random sample from the electoral roll; (b) comparison of...

To examine the relationship between alcohol consumption and cancer of the oesophagus, feasible studies include:

(a) questionnaire survey of a random sample from the electoral roll;

(b) comparison of history of alcohol consumption between a group of oesophageal cancer patients and a group of healthy controls, matched for age and sex;

(c) comparison of current oesophageal cancer rates in a group of alcoholics and a group of teetotallers;

(d) comparison by questionnaire of history of alcohol consumption between a group of oesophageal cancer patients and a random sample from the electoral roll in the surrounding district;

(e) comparison of death rates from cancer of the oesophagus in a large sample of subjects whose alcohol consumption has been determined in the past.