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Table 1 Descriptive characteristics of study sample (n = 404) and other Progression Subcohort members not analyzed (n = 986).

From: Evaluation of bone marrow lesion volume as a knee osteoarthritis biomarker - longitudinal relationships with pain and structural changes: data from the Osteoarthritis Initiative

  Study sample
mean (SD)
or
n (%)
Remainder of Progression subcohort1
mean (SD)
or
n (%)
Females 199 (49%) 594 (60%)*
Age (years) 62.9 (9.2) 63.7 (9.0)
Weight (kg) 85.0 (15.4) 85.9 (16.4)
Height (m) 1.7 (0.1) 1.7 (0.1)
Right knee 390 (97%) n/a2
Kellgren and Lawrence grade ≥2 287 (71%) 539 (78%)*
Primarily lateral tibiofemoral OA 62 (15%) 110 (16%)
Baseline WOMAC pain score 3.3 (3.4) 4.1 (3.9)*
Baseline WOMAC pain score = 0 109 (27%) 189 (24%)
Change in WOMAC pain score 0.0 (3.0) -0.3 (3.4)
Change in WOMAC pain score = 0 102 (25%) 174 (24%)
Total knee BML volume (baseline; cm3) 2.6 (2.7) n/a
Total knee BML volume (change; cm3) -0.2 (2.1) n/a
  1. Note: 1. Numbers for the remainder of the progression subcohort may vary due to missing data. 2. For the remainder of the progression subcohort we analyzed the right knee for knee-specific outcomes. *P <0.05 for chi-square or independent-sample t tests comparing study sample to the remainders of the progression subcohort. BML, bone marrow lesion; n/a, not applicable; OA, osteoarthritis; SD, standard deviation.