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Table 1 Comparison of characteristics between subjects

From: The association between subchondral bone cysts and tibial cartilage volume and risk of joint replacement in people with knee osteoarthritis: a longitudinal study

  Cyst present
(n = 52)
No cyst
(n = 57)
P value
Age (years) 64.5 (10.3) 62.1 (10.1) 0.22a
Female, number (%) 21 (40.4) 35 (61.4) 0.03b
Height (cm) 168.9 (9.6) 167.8 (8.4) 0.55a
Weight (kg) 83.1 (15.6) 83.0 (15.2) 0.98a
Body mass index (kg/m2) 29.1 (4.9) 29.5 (5.5) 0.67a
Kellgren-Lawrence grade ≥ 2, number (%) 37 (72.5) 41 (77.4 0.57b
Medial tibial cartilage volume (mm3) 1,819 (511) 1,769 (454) 0.58a
Lateral tibial cartilage volume (mm3) 1,855 (619) 2,156 (522) 0.01a
Medial tibial bone area (mm2) 2,246 (405) 1,976 (349) <0.001a
Lateral tibial bone area (mm2) 1,446 (243) 1,292 (229) 0.001a
Tibiofemoral BML present, number (%) 51 (98.1) 21 (36.8) <0.001b
Knee-joint replacement over 4 years, number (%) 9 (19.6) 7 (13.7) 0.44b
  1. BML, bone marrow lesion. Presented as mean (SD), unless otherwise stated. P value calculated by using independent sample t testa or χ2 testb.