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
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 | - | - |