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Table 2 Association between waiting time and the change in BPI from baseline to the 6-month follow-up, for the overall sample and by main rheumatic condition

From: The association between waiting time and multidisciplinary pain treatment outcomes in patients with rheumatic conditions

  BPI at baseline, Mean (SD) BPI at 6 months, Mean (SD) GEE models
Unadj.
p value a
Unadj. change from baseline to 6 months, EMM (95% CI) Adj. p value a,b Adj. change from baseline to 6 months, EMM b (95% CI)
Overall sample (n) 3228 1946 < 0.001   < 0.001  
 Total 5.97 (2.13) 5.20 (2.48)     
 <  2 months 5.77 (2.24) 4.61 (2.65)   −1.16 [− 1.45, − 0.87]   − 1.12 [− 1.42, − 0.81]
 2–6 months 6.12 (2.10) 5.38 (2.39)   − 0.70 [− 0.91, − 0.48]   − 0.70 [− 0.93, − 0.48]
 > 6 months 6.00 (2.07) 5.49 (2.34)   − 0.51 [− 0.69, − 0.32]   − 0.47 [− 0.66, − 0.28]
Osteoarthritis (n) 668 394     
 Total 5.71 (2.19) 4.87 (2.59) 0.004   0.033  
 <  2 months 5.73 (2.25) 4.33 (2.68)   − 1.40 [− 2.12, − 0.68]   − 1.24 [− 2.02, − 0.46]
 2–6 months 5.82 (2.20) 5.05 (2.56)   −0.63 [− 1.15, − 0.11]   − 0.66 [− 1.19, − 0.12]
 > 6 months 5.59 (2.13) 5.15 (2.50)   − 0.40 [− 0.85, 0.042]   −0.40 [− 0.85, 0.05]
Fibromyalgia (n) 677 359     
 Total 6.13 (2.11) 5.52 (2.40) 0.003   0.002  
 < 2 months 6.21 (2.05) 4.97 (2.44)   − 1.28 [− 1.98, −0.57]   − 1.30 [− 2.05, − 0.55]
 2–6 months 6.02 (2.20) 5.31 (2.53)   −0.72 [− 1.20, − 0.24]   −0.76 [− 1.27, − 0.24]
 > 6 months 6.20 (2.06) 6.02 (2.18)   − 0.35 [− 0.71, − 0.004]   −0.32 [− 0.65, 0.02]
  1. BPI Brief pain inventory (average score on the 0–10 interference items), SD standard deviation, GEE generalized estimating equations, EMM estimated marginal means, 95% CI 95% confidence interval
  2. a Time X group effect p value
  3. b Adjusted for age, sex, pain duration, number of comorbidities and income