Table 1.
Demographics of subjects.
| Patients with cLBP (P) (N = 17) | Healthy controls (HC) (N = 17) | NKI sample (N = 36) | P vs HC comparisons | |
|---|---|---|---|---|
| Age, mean (SE) | 37.4 (2.5) | 33.9 (2.4) | 34.5 (1.7) | P = 0.33 |
| Female, n (%) | 14 (82) | 14 (82) | 19 (67) | P > 0.99 |
| Right handed, n (%) | 17 (100) | 17 (100) | 38 (100) | P > 0.99 |
| Education, mean (SE) (y) | 15.2 (0.6) | 16.2 (0.3) | NA | P = 0.11 |
| STAI_T, mean (SE) | 32.9 (2.3) | 30.1 (1.5) | NA | P = 0.30 |
| BAI, mean (SE) | 7.3 (1.8) | 2.4 (0.7) | NA | P < 0.05 |
| BDI-II, mean (SE) | 5.9 (1.3) | 4.5 (1.0) | NA | P = 0.41 |
| PCS_total, mean (SE) | 15.7(2.1) | NA | NA | NA |
| PCS_rumination, mean (SE) | 6.7 (1.0) | NA | NA | NA |
| PCS_helplessness, mean (SE) | 6.1 (1.1) | NA | NA | NA |
| PCS_magnification, mean (SE) | 2.8 (0.4) | NA | NA | NA |
BAI, Beck Anxiety Inventory; BDI-II, Beck Depression Inventory II; NKI, Nathan Kline Institute; PCS, Pain Catastrophizing Scale; SF-MPQ, Short-Form McGill Pain Questionnaire; STAI-T, Trait form of the State-Trait Anxiety Inventory.