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Table 3 Cross-correlation of the study groups with predicted cluster membership based on the hierarchical clustering; summary statistics is presented for clusters of equal or greater size than five participants

From: Quality of life in Croatian Homeland war (1991-1995) veterans who suffer from post-traumatic stress disorder and chronic pain

Predicted cluster number Study group Total Mean ± SD, QOL1 Cluster distribution P*
  PTSD+LBP PTSD LBP Controls    
1 62 (77.5) 46 (78.0) 56 (58.9) 17 (12.6) 181 2.93 ± 0.80 < 0.001
2 1 (1.3) 6 (10.2) 37 (38.9) 115 (85.2) 159 4.11 ± 0.61 < 0.001
3 14 (17.5) 2 (3.4) 1 (1.1) 1 (0.7) 18 1.44 ± 0.62 < 0.001
4 1 (1.3) 3 (5.1) 1 (1.1) 0 (0) 5 2.60 ± 0.89 0.004
5 1 (1.3) 1 (1.7) 0 (0) 0 (0) 2 - -
6 0 (0) 0 (0) 0 (0) 2 (1.5) 2 - -
7 1 (1.3) 0 (0) 0 (0) 0 (0) 1 - -
8 0 (0) 1 (1.7) 0 (0) 0 (0) 1 - -
Total 80 59 95 135 369 - -
  1. *Due to small number of participants in some groups Fisher's exact test was used