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Table 1 Characteristics of participants with symptomatic knee OA in each cohort at each time point

From: Comparing the functional impact of knee replacements in two cohorts

  MOST study OAI study
Baseline (N = 824) 30 month (N = 818) 60 month (N = 765) Baseline (N = 880) 24 month (N = 793) 48 month (N = 762)
Age, mean (SD), year 66.1 (6.4) 66.6 (6.7) 67.3 (6.8) 66.1 (6.7) 66.3 (6.9) 66.9 (7.1)
N (%) of women 541 (65.7) 527 (64.4) 512 (66.9) 515 (58.5) 486 (61.3) 451 (59.2)
N (%) of race       
 Whites 679 (82.4) 672 (82.2) 631 (82.5) 633 (71.9) 627 (79.1) 604 (79.3)
 Blacks 137 (16.6) 139 (17.0) 118 (15.4) 219 (24.9) 147 (18.5) 135 (17.7)
 Others 8 (1.0) 7 (0.9) 16 (2.1) 28 (3.2) 19 (2.4) 23 (3.0)
BMI, mean (SD), kg/m2 32.6 (6.6) 32.5 (6.5) 32.9 (6.8) 29.9 (4.7) 30.1 (4.8) 30.4 (4.9)
CES-D, mean (SD) 8.7 (8.5) 8.0 (7.6) 7.8 (7.6) 7.1 (6.9) 6.9 (7.3) 7.5 (7.5)
Charlson comorbidity score, mean (SD) 0.7 (1.0) 0.8 (1.2) 0.9 (1.4) 0.5 (0. 9) 0.6 (1.0) 0.5 (1.0)
# of painful joints in lower limb other than knee, mean (SD) 2.0 (1.9) 1.4 (1.7) 1.9 (1.8) 1.0 (1.4) 0.9 (1.3) 0.9 (1.3)
N (%) with KR       
 Unilateral KR 77 (9.3) 139 (17.0) 167 (21.8) 57 (6.5) 88 (11.1) 123 (16.1)
 Bilateral KR 0 (0) 29 (3.6) 101 (13.2) 0 (0) 4 (0.5) 19 (2.5)
N (%) with partial and total KR       
 Partial KR 3 (0.4) 9 (1.1) 10 (1.3) 0 (0.00) 0 (0.00) 2 (0.3)
 Total KR 74 (9.0) 158 (19.3) 257 (23.6) 57 (6.5) 92 (11.6) 139 (18.2)
 Partial KR and total KR 0 (0) 1 (0.1) 1 (0.1) 0 (0) 0 (0) 0 (0)
WOMAC function, mean (SD) 24.3 (11.7) 23.0 (12.5) 19.0 (12.2) 19.6 (12.6) 17.5 (12.4) 17.0 (11.9)
Maximal WOMAC knee pain scale, mean (SD) 7.3 (3.7) 6.8 (3.9) 5.6 (3. 9) 6 (3.9) 5.6 (3.8) 5.5 (3.7)