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Table 4 Model-predicted mean (95% CI) outcomes per group over time

From: Feasibility cluster randomised controlled trial evaluating a theory-driven group-based complex intervention versus usual physiotherapy to support self-management of osteoarthritis and low back pain (SOLAS)

Outcome Group Time No. clusters Cluster ICC Participant ICC
Baseline 6 weeks 2 months 6 months
Short-form 12 physical component score (SF12-PCS)
 Score (0–100) Usual PT N = 61 40.0 (37.8, 42.3)    N = 51 43.7 (41.3, 46.1) N = 43 43.7 (41.2, 46.3) 7 0.0 0.56
SOLAS N = 59 39.9 (37.6, 42.2)    N = 50 44.1 (41.7, 46.6) N  = 43 42.2 (39.6, 44.8) 7
Pain
 Intensity [NRS, 0–10] Usual PT N = 61 6.2 (5.5, 6.8)    N = 51 4.3 (3.6, 4.9) N = 43 4.6 (3.9, 5.4) 7 0.0 0.38
SOLAS N = 59 5.7 (5.1, 6.4)    N = 50 4.8 (4.1, 5.4) N = 43 4.3 (3.6, 5.1) 7
 Bothersomeness 0–10) Usual PT N = 61 3.2 (2.9, 3.5)    N = 51 2.6 (2.3, 2.9) N = 43 2.6 (2.3, 2.9) 7 0.0 0.35
SOLAS N = 59 3.0 (2.7, 3.3)    N = 50 2.7 (2.4, 3.0) N = 43 2.7 (2.4, 3.0) 7
Roland Morris disability questionnaire (RMDQ)
 Total score (0–24) Usual PT N = 41 12.2 (10.3, 14.1)    N = 33 7.9 (5.9, 9.8) N = 26 6.6 (4.5, 8.7) 7 0.0 0.67
SOLAS N = 34 13.0 (11,0, 15.1)    N = 29 9.5 (7.4, 11.7) N = 25 9.4 (7.1, 11.6) 7
Western Ontario and McMaster Universities Arthritis Index (WOMAC) function daily living
 Hip subscale score (0–68) Usual PT N = 14 21.5 (13.4, 29.5)    N = 12 23.4 (15.2, 31.6) N = 10 22.4 (14.0, 30.8) 7 0.27 0.49
SOLAS N = 12 24.7 (16.3, 33.1)    N = 9 23.4 (14.5, 32.3) N = 10 22.1 (13.4, 30.9) 7
 Knee subscale score (0–68) Usual PT N = 26 21.1 (15.7, 26.6)    N = 21 20.8 (15.0, 26.7) N = 19 23.7 (17.7, 29.7) 7 0.13 0.50
SOLAS N = 29 24.8 (19.5, 30.2)    N = 27 23.9 (18.4, 29.3) N = 21 26.7 (20.9, 32.6) 7
Hospital anxiety and depression scale (HADS)
 Total score (0–42) Usual PT N = 61 12.5 (10.6, 14.4)    N = 48 10.3 (8.3, 12.3) N = 43 10.1 (8.0, 12.1) 7 0.22 0.51
SOLAS N = 58 12.1 (10.2, 14.1)    N = 45 9.1 (7.1, 11.2) N = 39 8.8 (6.7, 10.9) 7
 Anxiety scale (0–21) Usual PT N = 61 7.3 (6.2, 8.4)    N = 48 5.7 (4.5, 6.8) N = 43 5.4 (4.2, 6.6) 7 0.05 0.66
SOLAS N = 58 7.2 (6.1, 8.4)    N = 45 5.2 (4.0, 6.4) N = 39 5.1 (3.8, 6.3) 7
 Depression scale (0–21) Usual PT N = 61 5.1 (4.2, 6.1)    N = 48 4.6 (3.6, 5.6) N = 43 4.57 (3.5, 5.6) 7 0.31 0.31
SOLAS N = 58 5.0 (4.0, 5.9)    N = 45 4.0 (2.9, 5.0) N = 39 3.69 (2.6, 4.8) 7
Global perceived effect scale (GPE)
 Total score (−5 to + 5) Usual PT N = 61 −2.0 (−2.8, −1.2)    N = 50 1.9 (1.1, 2.7) N = 43 1.1 (0.2, 2.0) 7 0.0 0.0
SOLAS N = 59 −1.9 (− 2.7, 1.1)    N = 49 1.7 (0.9, 2.6) N = 41 1.4 (0.5, 2.3) 7
EuroQol 5-D (EQ5D)a
 Weighted Health Index, median [IQR], (−.59 to + 1.00) Usual PT N = 61 0.69 (0.59, 0.73)    N = 49 0.73 (0.66, 0.80) N = 43 0.73 (0.62, 0.80) 7 N/A N/A
SOLAS N = 59 0.69 (0.62, 0.76)    N = 45 0.73 (0.69, 0.76) N = 39 0.69 (0.62, 0.80) 7
  1. aNon-normal distributions, descriptive statistics only presented