<qa>  What is the primary hypothesis for the primary hypothesis?SAMPLE SIZE The hypotheses listed in Aims of the Project will be tested by constructing predictive models incorporating exercise variables and factors known to be related to outcome following surgery e.g. age, gender, open versus laparascopic surgery. For the primary hypothesis, models will be developed to predict the risk of one year mortality using i baseline exercise capacity and ii baseline exercise capacity and the relative decrease in exercise capacity. 