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Table 1 Characteristics of baseline and first 2-year course factors

From: Diagnosis of early stage knee osteoarthritis based on early clinical course: data from the CHECK cohort

Factors

Baseline, presented positive

N (%)

Decrease/negative at both time points

N (%)

Stable/positive at either time point

N (%)

Increase/positive at both time points

N (%)

BMI

26.3 (4.2)c

154 (13)

892 (75)

139 (12)

Bilateral knee pain

848 (72)

152 (13)

447 (37)

586 (50)

Joint line tenderness

528 (45)

541 (45)

390 (33)

254 (22)

Bony swelling

43 (4)

1092 (92)

88 (7)

5 (1)

Joint warmth

48 (4)

1103 (93)

77 (6)

5 (1)

Joint effusion

80 (7)

1042 (88)

137 (11)

6 (1)

PF joint crepitus

533 (45)

500 (42)

319 (27)

366 (31)

PF joint grinding

370 (31)

727 (61)

320 (27)

138 (12)

Restricted/painful flexion

327 (30)

359 (30)

458 (39)

368 (31)

Restricted/painful extension

606 (51)

706 (60)

360 (30)

119 (10)

Heberden nodes

604 (52)

384 (32)

270 (23)

531 (45)

WOMAC paina

 Walking

202 (17)

273 (23)

664 (56)

248 (21)

 Standing

249 (21)

248 (21)

652 (55)

285 (24)

 Stairs

569 (48)

332 (28)

592 (50)

261 (22)

 Night

379 (32)

380 (32)

545 (46)

260 (22)

 Rest

308 (26)

320 (27)

628 (53)

237 (20)

WOMAC functiona

 Descending

355 (30)

332 (28)

593 (50)

260 (22)

 Ascending

486 (41)

332 (28)

569 (48)

284 (24)

 Rising

438 (37)

320 (27)

640 (54)

225 (19)

 Standing

225 (19)

237 (20)

675 (57)

273 (23)

 Walking

166 (14)

236 (20)

712 (60)

237 (20)

 Sitting

178 (15)

263 (22)

687 (58)

235 (20)

WOMAC morning stiffnessa

590 (50)

379 (32)

545 (46)

261 (22)

Medial TF osteophyteb

130 (11)

20 (2)

950 (80)

215 (18)

Lateral TF osteophyteb

189 (16)

10 (1)

904 (76)

271 (23)

Medial TF JSNb

73 (6)

24 (2)

960 (81)

201 (17)

Lateral TF JSNb

11 (1)

35 (3)

1045 (88)

105 (9)

PF osteophyteb

130 (11)

23 (2)

1055 (89)

107 (9)

PF JSNb

36 (3)

9 (1)

955 (81)

221 (18)

TF angle

− 1.8 (1.8)c

305 (26)

761 (64)

119 (10)

  1. BMI, body mass index; PF joint, patellofemoral joint; WOMAC, Western Ontario and McMaster Universities Osteoarthritis Index; TF, tibiofemoral; JSN, joint space narrowing; percentages are calculated by dividing total number of knees (1185)
  2. aAll the WOMAC items have 5 grades (0 to 4). Patient graded at 2 or more were treated as positive presentation at baseline
  3. bRadiographic items were graded according to Kellgren & Lawrence criteria with 5 grades (0–4), and grade 2 or more was treated as positive presentation at baseline
  4. cPresented as mean (standard deviation)