Participants’ baseline characteristics according to quartile intake of total fibre in OAI and Framingham OA Study
| OAI (n=4051) | Framingham (n=971) | |||||||
| Q1 (n=1013) | Q2 (n=1012) | Q3 (n=1013) | Q4 (n=1013) | Q1 (n=242) | Q2 (n=244) | Q3 (n=242) | Q4 (n=243) | |
| Age at baseline (years)* | 59.8 (9.0) | 60.9 (9.1) | 62.0 (9.1) | 62.8 (9.1) | 51.5 (7.8) | 53.4 (7.6) | 54.5 (8.1) | 56.0 (8.0) |
| Sex (men) n (%) | 422 (41.7) | 421 (41.6) | 422 (41.7) | 422 (41.7) | 109 (45.1) | 112 (45.9) | 110 (45.3) | 111 (45.7) |
| Race (Caucasian), n (%) | 807 (79.7) | 848 (83.8) | 836 (82.5) | 819 (80.8) | – | – | – | – |
| BMI (kg/m2) | 29.4 (4.9) | 28.7 (4.7) | 28.6 (4.8) | 27.6 (4.4) | 27.2 (5.0) | 27.1 (4.5) | 27.0 (4.1) | 26.6 (4.6) |
| Tobacco use, n (%) | ||||||||
| Never | 803 (79.3) | 803 (79.3) | 787 (77.7) | 810 (80.0) | 185 (76.4) | 209 (85.8) | 221 (91.3) | 226 (93.0) |
| Current smokers | 210 (21.7) | 209 (21.7) | 226 (23.3) | 203 (20.0) | 210 (21.7) | 209 (21.7) | 226 (23.3) | 203 (20.0) |
| Education, n (%) | ||||||||
| < College level | 463 (45.7) | 404 (39.9) | 360 (35.5) | 337 (33.3) | 175 (72.2) | 168 (68.9) | 159 (65.6) | 150 (61.9) |
| College level or above | 550 (54.3) | 608 (60.1) | 653 (64.5) | 676 (66.7) | 67 (27.8) | 76 (31.1) | 83 (34.4) | 93 (38.1) |
| PASE | 155.6 (79.8) | 161.2 (82.2) | 164.6 (80.7) | 168.0 (84.4) | 36.0 (4.8) | 35.3 (4.2) | 36.0 (5.6) | 35.6 (4.4) |
| Prevalence of ROA, n (%) | 116 (11.5) | 113 (11.2) | 110 (10.9) | 104 (10.3) | 14 (5.6) | 21 (8.5) | 14 (5.8) | 17 (6.9) |
| Pain, aching or stiffness† n (%) | 115 (11.4) | 105 (10.4) | 99 (9.8) | 99 (9.8) | 45 (18.7) | 38 (15.7) | 36 (14.9) | 32 (13.0) |
| Total energy, kcal/day | 1407.0 (566.8) | 1443.7 (553.3) | 1399.4 (536.3) | 1363.6 (507.3) | 2041.4 (632.4) | 1698.5 (557.8) | 1818.8 (586.0) | 1867.8 (575.9) |
| Total dietary fibre, g/day | 9.1 (3.7) | 13.0 (4.3) | 16.0 (5.2) | 21.9 (8.0) | 14.1 (5.4) | 15.1 (5.0) | 19.2 (5.3) | 26.6 (8.2) |
| Cereal fibre | 4.2 (2.2) | 5.3 (2.6) | 6.3 (3.2) | 7.8 (4.7) | 5.0 (2.6) | 5.1 (2.5) | 6.3 (3.0) | 8.2 (4.2) |
| Fruit and vegetable fibre | 4.2 (2.0) | 6.5 (2.7) | 8.2 (3.3) | 11.5 (5.6) | 4.9 (2.3) | 6.0 (2.6) | 8.1 (2.8) | 12.7 (5.3) |
| Nut and legume fibre | 1.0 (0.9) | 1.6 (1.1) | 2.0 (1.6) | 2.9 (2.6) | 1.8 (1.3) | 2.0 (1.4) | 2.5 (1.6) | 3.4 (2.3) |
| Median glycaemic load (ref: bread), g/day | – | – | – | – | 170.4 | 147.0 | 170.0 | 199.2 |
| Saturated fats, g/day | 21.5 (10.2) | 20.2 (9.4) | 18.0 (8.6) | 14.8 (7.4) | 26.6 (10.8) | 21.5 (9.3) | 21.5 (9.4) | 18.2 (8.4) |
| Polyunsaturated fatty acids, g/day | 11.0 (5.6) | 11.5 (0.7) | 10.8 (5.3) | 10.0 (5.2) | 14.5 (6.6) | 12.8 (5.6) | 13.8 (5.6) | 13.1 (5.3) |
| Vitamin C, mg/day | 87.9 (57.6) | 106.6 (56.0) | 116.4 (60.7) | 137.7 (68.4) | 201.0 (210.2) | 208.0 (245.4) | 221.4 (228.4) | 293.6 (275.3) |
| Vitamin K, µg/day | 100.2 (68.3) | 148.3 (100.5) | 185.0 (119.9) | 286.0 (222.5) | 120.1 (62.7) | 132.9 (69.1) | 165.1 (83.0) | 230.2 (134.2) |
| DGAI-2010 score | – | – | – | – | 50.1 (8.8) | 54.9 (8.5) | 60.7 (7.6) | 66.7 (8.0) |
*All such values are mean±SD.
†Pain more than half day for most days in past month.
‡KL, Kellgren-Lawrence grading scale.
DGAI-2010, Dietary Guidelines Adherence Index; PASE, Physical Activity in the Elderly Scale; OAI, Osteoarthritis Initiative; OA, osteoarthritis; ROA, radiographic OA.