To facilitate specific target group prevention measures, sociodemographic indicators of the clusters were investigated and set in relation to Cluster 1 (‘No Risk Behaviours’). The odds ratios for cluster membership according to different social factors are shown in table 2. The composition of the ‘healthaware’ Cluster 1 was as follows: 60.4% female, 46.3% aged 50– 59 and 71% in the middle or upper SES categories.