Measures Cluster1 (Cognitive) N=42 (31) Cluster 2 (Low) N=129 (97) Cluster 3 (Somatic) N=57 (44) Cluster 4 (High) N=42 (31) p-value HAD anxiety 7.33 (3.06) 3.06 (2.92) 8.08 (3.75) 10.42 (3.81) <0.001* HAD depression 5.26 (3.69) 1.66 (2.31) 1.66 (2.31) 8.00 (3.83) <0.001* Health comp. 17.88 (9.17) 9.11 (7.12) 19.25 (7.88) 31.12 (13.16) <0.001** GOSE 6.22 (0.65) 7.23 (0.73) 6.35 (0.83) 5.95 (0.70) <0.001* Sickness absc. 53 % 26 % 56% 48% 0.001 * All clusters different except for 3 and 1 **Cluster 2 differed from 1, 3 and 4

Table 8: The mean score (and SD) for the anxiety and depression subscale of the Hospital Anxiety and Depression Scale, the Subjective Health Complaints inventory, the Glasgow Outcome Scale Extended (GOSE) score and the percentage of subjects reporting sickness-related absence for the four cluster solutions. The number of patients in each cluster is shown. Students and pupils were not included in the analysis of sickness absence, and the number of subjects for this analysis is shown in parentheses.