Baseline characteristics by treatment arm in the ITT population
| Characteristic | Randomised groups | |
| tCBT (n=500) | Usual care (n=496) | |
| Median (IQR) | Median (IQR) | |
| Age (years) | 58.8 (47.7–68.7) | 59.5 (47.9–68.9) |
| N (%) | N (%) | |
| Gender | ||
| Male | 209 (41.8) | 204 (41.0) |
| Female | 291 (58.2) | 292 (58.9) |
| Employment status | ||
| Working (full or part-time) | 277 (55.4) | 244 (49.2) |
| Unable to work because of health | 18 (3.6) | 30 (6.0) |
| Retired | 168 (33.6) | 177 (35.7) |
| Other | 37 (7.4) | 45 (9.1) |
| CWP risk profile: | ||
| Illness behaviour score >4 | ||
| No | 1 (0.2) | 2 (0.5) |
| Yes | 498 (99.6) | 494 (99.5) |
| Not known* | 1 (0.2) | 0 (0.0) |
| Somatic Symptom Scale score >2 | ||
| No | 472 (94.4) | 462 (93.1) |
| Yes | 28 (5.6) | 34 (6.9) |
| Sleep problems score >4 | ||
| No | 1 (0.2) | 2 (0.4) |
| Yes | 499 (99.8) | 493 (99.4) |
| Not known* | 0 (0.0) | 1 (0.2) |
| CWP risk profile factors present (N) | ||
| 2 | 474 (94.8) | 466 (94.0) |
| 3 | 26 (5.2) | 30 (6.0) |
| Median (IQR) (n)† | Median (IQR) (n) | |
| Psychological distress (GHQ) | 1 (0–4) (499) | 1 (0–4) (494) |
| Quality of Life (EQ-5D-5L utility score) | 0.74 (0.65–0.80) (499) | 0.74 (0.64–0.80) (496) |
| ICECAP-A | 0.91 (0.81–0.95) (495) | 0.90 (0.79–0.95) (491) |
| Fibromyalgia research criteria | ||
| WPI | 3 (1–4) (499) | 2 (1–4) (492) |
| SSS | 4 (3–6) (497) | 4 (3–5) (494) |
*Where individuals completed half or fewer items, the score was classified as not known, but individuals could still be eligible for recruitment based on their responses to other items answered.
†The number of persons for whom a scale score could be calculated.
EQ-5D-5L, EuroQol Questionnaire-five dimensions-five levels; GHQ, General Health Questionnaire; ICECAP-A, ICEpop CAPability measure for Adults; ITT, intention to treat; SSS, Symptom Severity Scale; tCBT, telephone-delivered cognitive–behavioural therapy; WPI, Widespread Pain Index.