Changes in mental health outcomes at 6-month and 12-month follow-up between participants randomised to control or the Burn 2 Learn intervention
| Secondary outcomes | No of clusters (participants) | Mean change from baseline (95% CI) | Adjusted difference at follow-up* | |||
| Control | Intervention | Control | Intervention | Coefficient (95% CI) | P value | |
| Cortisol (pg/mg): 6 months | 5 (141) | 5 (157) | 2.00 (0.48 to 3.53) | −2.08 (−4.86 to 0.69) | −3.80 (−6.67 to −0.93) | 0.010 |
| Perceived stress: 6 months | 10 (331) | 10 (337) | −0.37 (−1.04 to 0.30) | −0.43 (−1.03 to 0.18) | −0.02 (−0.89 to 0.86) | 0.972 |
| Perceived stress: 12 months | 10 (333) | 10 (337) | 0.90 (0.11 to 1.69) | 0.83 (−0.09 to 1.75) | −0.16 (−1.22 to 0.90) | 0.771 |
| Internalising problems: 6 months | 10 (331) | 10 (337) | 0.17 (−0.13 to 0.47) | 0.06 (−0.23 to 0.34) | −0.13 (−0.53 to 0.28) | 0.535 |
| Internalising problems: 12 months | 10 (333) | 10 (337) | 0.18 (−0.12 to 0.47) | 0.19 (−0.15 to 0.53) | −0.10 (−0.54 to 0.33) | 0.637 |
| Externalising problems: 6 months | 10 (331) | 10 (337) | 0.15 (−0.16 to 0.45) | 0.25 (−0.04 to 0.54) | 0.09 (−0.32 to 0.51) | 0.665 |
| Externalising problems: 12 months | 10 (333) | 10 (337) | 0.16 (−0.18 to 0.49) | −0.15 (−0.46 to 0.16) | −0.19 (−0.62 to 0.24) | 0.386 |
| Well-being: 6 months | 10 (332) | 10 (337) | 0.45 (−0.15 to 1.05) | −0.31 (−0.85 to 0.23) | −0.69 (−1.47 to 0.09) | 0.084 |
| Well-being: 12 months | 10 (333) | 10 (337) | 0.42 (−0.26 to 1.10) | −0.13 (−0.73 to 0.48) | −0.46 (−1.28 to 0.36) | 0.273 |
| HIIT self-efficacy: 6 months | 10 (332) | 10 (337) | −0.05 (−0.25 to 0.16) | 0.78 (0.56 to 1.00) | 0.80 (0.50 to 1.10) | <0.001 |
| HIIT self-efficacy: 12 months | 10 (333) | 10 (337) | −0.05 (−0.27 to 0.17) | 0.80 (0.54 to 1.06) | 0.80 (0.49 to 1.11) | <0.001 |
| Intrinsic motivation for exercise: 6 months | 10 (331) | 10 (337) | −0.08 (−0.16 to 0.01) | 0.00 (−0.09 to 0.09) | 0.07 (−0.05 to 0.19) | 0.240 |
| Intrinsic motivation for exercise: 12 months | 10 (333) | 10 (337) | −0.05 (−0.16 to 0.05) | 0.01 (−0.09 to 0.11) | 0.07 (−0.06 to 0.20) | 0.290 |
| Identified motivation for exercise: 6 months | 10 (331) | 10 (337) | −0.02 (−0.10 to 0.05) | 0.01 (−0.06 to 0.09) | 0.03 (−0.07 to 0.14) | 0.548 |
| Identified motivation for exercise: 12 months | 10 (333) | 10 (337) | 0.03 (−0.06 to 0.13) | 0.08 (−0.02 to 0.17) | 0.04 (−0.08 to 0.15) | 0.504 |
*Adjusted difference ((intervention post-test mean−intervention baseline mean)−(control post-test mean−control baseline mean)). P value adjusted for cluster effect and randomisation pair.
HIIT, high-intensity interval training; pg/mg, pictogram of cortisol per microgram of hair.