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Table 3 Odds ratios and 95% confidence intervals for the association between DII and severe pain and disability according to tertiles of DII score in patients with knee osteoarthritis

From: Dietary inflammatory index is associated with pain intensity and some components of quality of life in patients with knee osteoarthritis

  DII score p for trenda Continuous OR 95% CI
DII Score Tertile 1
(< − 1.3) (n = 73)
DII Score Tertile 2
(− 1.3 to 4.5) (n = 73)
DII Score Tertile 3
(> 4.5) (n = 74)
VAS
 Model 0 Ref. 1.19 (0.66–1.75) 1.33 (0.88–2.05) 0.17 1.22 (0.71–1.91)
 Model I Ref. 1.05 (0.72–1.87) 1.55 (1.04–2.31) 0.04 1.48 (1.26–2.02)
WOMAC
 Model 0 Ref. 1.09 (0.59–1.46) 1.59 (0.77–1.99) 0.78 1.40 (0.91–1.61)
 Model I Ref. 1.18 (0.48–1.84) 1.63 (0.61–2.13) 0.09 1.52 (0.58–1.90)
  1. Model 0, Crude; Model I, Adjusted for age, sex, body mass index and physical activity
  2. VAS was converted to tertiles, considering the first tertile (VAS < 4 cm) as mild, second tertile (4 cm ≤ VAS ≤ 7 cm) as moderate, and the last tertile (VAS > 7 cm) as severe [40]. WOMAC was converted to tertiles, considering the first tertile (WOMAC < 24 points) and second tertile (25 cm ≤ WOMAC ≤ 48 cm), and the last tertile (WOMAC > 48 cm)
  3. DII dietary inflammatory index, VAS visual analogue scale, WOMAC Western Ontario and McMaster Index
  4. aLogistic regression analysis