# Table 3 Mean (SD) and p-value for between group differences using linear mixed models

Baseline Post-treatment (max. 8-weeks) 6 months 12 months Mean differences between groups (0–12 months)
Mean (SD) Mean (SD) Mean (SD) Mean (SD) p value
Outcome Control group (n = 54) Intervention group (n = 54) Control group (n = 54) Intervention group (n = 52) Control group (n = 52) Group 2 Intervention (n = 51) Control group (n = 49) Intervention group (n = 49)
Primary
RMD 9.9 (4.7) 9.9 (4.2) 5.8 (5.1) 5.4 (3.8) 5.0 (4.6) 5.1 (4.0) 5.3 (5.1) 4.2 (3.7) 0.70
PSEQ 37.8 (13.0) 40.1 (10.0) 44.3 (13.8) 45.2 (12.0) 45.7 (11.5) 45.9 (11.7) 47.6 (12.2) 50.2 (9.4) 0.52
Secondary
Pain and function
PNRS 4.9 (2.05) 5.1 (1.8) 2.9 (2.0) 2.8 (2.0) 3.2 (2.2) 3.2 (2.2) 4.0 (2.1) 3.0 (2.1) 0.95
WAI 5.6 (2.1) 5.7 (2.1) 6.3 (2.3) 6.5 (2.0) 6.4 (2.3) 6.5 (1.9) 6.2 (2.5) 6.8 (2.2) 0.62
Psychological
PCS Total 20.9 (12.5) 20.0 (11.3) 14.9 (10.5) 15.5 (11.6) 11.5 (8.8) 13.4 (9.8) 12.8 (10.1) 11.8 (10.0) 0.89
PCS Rumination 7.6 (4.3) 7.6 (4.2) 5.8 (4.1) 5.6 (4.1) 4.6 (3.7) 5.1 (3.7) 5.1 (4.2) 4.5 (3.7) 0.97
PCS Magnification 4.2 (3.0) 3.6 (2.8) 2.8 (2.2) 2.9 (2.6) 2.1 (1.8) 2.4 (2.2) 2.6 (2.2) 2.1 (2.5) 0.69
PCS Helplessness 9.1 (6.0) 8.9 (5.6) 6.4 (4.9) 7.0 (5.7) 4.8 (3.9) 6.0 (4.6) 5.1 (4.4) 5.2 (4.8) 0.61
DASS21 Total 16.8 (12.6) 15.0 (10.1) 13.3 (11.3) 12.2 (9.5) 11.0 (9.0) 10.8 (7.3) 11.2 (9.4) 9.8 (8.1) 0.49
DASS21 Depression 5.5 (5.3) 5.3 (4.8) 4.2 (4.5) 4.2 (4.6) 3.0 (3.0) 3.7 (3.8) 3.5 (3.5) 3.2 (3.5) 0.98
DASS21 Anxiety 3.6 (3.6) 2.8 (2.9) 3.0 (3.3) 2.4 (2.7) 2.6 (3.0) 2.0 (2.1) 2.7 (3.3) 2.1 (2.5) 0.19
DASS21 Stress 7.7 (4.7) 7.0 (3.9) 6.1 (4.3) 5.6 (3.3) 5.4 (3.8) 5.2 (3.1) 5.0 (3.7) 4.4 (3.2) 0.41
1. Note: The baseline within-group means were calculated from baseline data. The within-group mean estimates for post-treatment 6 and 12 – months were calculated from linear mixed models