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Table 1 Participants’ baseline characteristics according to quartiles of the energy-adjusted dietary inflammatory index in OAI

From: Inflammatory potential of diet and risk of incident knee osteoarthritis: a prospective cohort study

  Eligible participants for incident ROA Eligible participants for incident SxOA
Q1 (n = 448) Q2 (n = 446) Q3 (n = 446) Q4 (n = 446) Q1 (n = 736) Q2 (n = 735) Q3 (n = 735) Q4 (n = 734)
E-DII median in men (IQR) − 3.5 (− 5.5, − 2.9) − 2.1 (− 2.8, − 1.4) − 0.7 (− 1.4, 0.3) 1.3 (0.3, 3.8) − 3.5 (− 5.5, − 2.9) − 2.1 (− 2.9, − 1.5) − 0.7 (− 1.5, 0.3) 1.3 (0.3, 3.9)
E-DII median in women (IQR) − 4.1 (− 5.6, − 3.5) − 3.0 (− 3.5, − 2.4) − 1.8 (− 2.4, − 0.9) 0.4 (− 0.9, 3.9) − 4.1 (− 5.6, − 3.5) − 3.0 (− 3.5, − 2.5) − 1.9 (− 2.5, − 1.0) 0.1 (− 1.0, 3.9)
Age (years)* 61.0 ± 9.2 60.7 ± 9.1 58.9 ± 9.1 57.2 ± 8.4 62.8 ± 9.1 62.0 ± 9.2 61.1 ± 9.4 58.9 ± 8.7
Female, n (%) 259 (57.8) 258 (57.8) 258 (57.8) 258 (57.8) 431 (59.0) 431 (58.6) 431 (58.6) 430 (58.6)
Race (European-American), n (%) 385 (86.3) 384 (86.1) 390 (87.4) 351 (78.9) 636 (87.0) 631 (85.9) 633 (81.5) 597 (85.0)
Education, n (%)
 < College level 136 (30.4) 149 (33.4) 165 (37.0) 192 (43.1) 227 (31.0) 225 (30.6) 293 (39.9) 317 (43.2)
 College level or above 312 (69.6) 297 (66.6) 281 (63.0) 254 (56.9) 509 (69.0) 510 (69.4) 442 (60.1) 417 (56.8)
Yearly income, n (%)
 < 50,000 US$ 128 (30.5) 148 (34.6) 142 (33.6) 166 (39.6) 241 (35.0) 244 (34.9) 256 (36.7) 273 (39.6)
 ≥ 50,000 US$ 292 (69.5) 280 (65.4) 281 (66.4) 253 (60.4) 448 (65.0) 455 (65.1) 442 (63.3) 417 (60.4)
Tobacco use, n (%)
 Non-smoker 361 (80.6) 343 (77.4) 345 (77.7) 360 (81.2) 591 (80.4) 574 (78.4) 576 (78.6) 584 (80.1)
 Smoker 87 (19.4) 100 (22.6) 99 (22.3) 83 (18.8) 144 (19.6) 158 (21.6) 157 (21.4) 145 (19.9)
BMI (kg/m2)* 26.3 ± 4.1 27.6 ± 4.6 27.7 ± 4.3 27.8 ± 4.8 26.9 ± 4.3 27.9 ± 4.5 28.2 ± 4.5 28.8 ± 4.9
PASE* 179.0 ± 82.8 161.4 ± 80.1 164.1 ± 80.9 168.4 ± 84.0 169.1 ± 83.1 159.6 ± 78.1 159.6 ± 80.4 161.4 ± 81.0
Total energy intake (kcal/day)* 1274.7 ± 453.1 1323.2 ± 486.0 1473.4 ± 595.0 1511.9 ± 634.4 1298.3 ± 475.6 1321.4 ± 468.3 1449.3 ± 581.6 1501.1 ± 621.1
  1. OAI Osteoarthritis Initiative, ROA radiographic knee osteoarthritis, SxOA symptomatic knee osteoarthritis, E-DII energy-adjusted dietary inflammatory index, IQR interquartile range
  2. *All such values are mean ± standard deviation
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