“…To develop the risk model, a range of risk indicators were identified which have individually been found either to predict depression at follow-up or to be associated with the prevalence of depression in community studies. Relevant risk factors shown in cohort studies to predict depression included in this cohort study were initial depression levels [4,11], use of alcohol [11,12], cannabis use [13-15], smoking [16,17], life events [4,18,19], chronic illness [4], medical illness [4,20], low level of education or low levels of mastery [21], employment status or financial pressure [22,23], religious service attendance [24,25], living alone [5], age and gender [10]. Evidence from intervention trials also point to the importance of physical activity in the treatment of depression [26].…”