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Table 2 Pain score time-trends in 1-year after TKA

From: Preoperative pain catastrophizing and postoperative pain after total knee arthroplasty: a prospective cohort study with one year follow-up

  Mean (SD)   Mean difference (95 % CI) P-value
2 days 4.3 (2.0) 2 weeks 0.6 (0.0,1.3) 0.046
   8 weeks 1.4 (0.8,2.2) < 0.001
   52 weeks 1.9 (1.1,2.7) < 0.001
2 weeks 3.7 (2.2) 2 days −0.6 (−1.3,–0.0) 0.046
   8 weeks 0.8 (0.2,1.5) 0.007
   52 weeks 1.3 (0.5,2.1) < 0.001
8 weeks 2.9 (2.3) 2 days –1.4 (–2.2,–0.8) < 0.001
   2 weeks –0.8 (–1.5,–0.2) 0.007
   52 weeks 0.5 (–0.3,1.2) 0.592
52 weeks 2.4 (2.4) 2 days –1.9 (–2.7,–1.1) < 0.001
   2 weeks –1.3 (–2.1,–1.1) < 0.001
   8 weeks –0.5 (–1.2,0.3) 0.592
  1. Pain measured by the item “average pain” in the Brief Pain Inventory (BPI)
  2. TKA (Total Knee Arthroplasty)
  3. Mixed Linear Models to account for dependency caused by repeated measures data