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Table 2 BMD and Z scores in JDM patients and controls in total, <20y and ≥ 20y

From: Bone mineral density and explanatory factors in children and adults with juvenile dermatomyositis at long term follow-up; a cross sectional study

Variable Patients (n = 59) Controls (n = 59) Patients <20y (n = 28)
≥20y (n = 31)
Controls <20y (n = 28)
≥20y (n = 30–31)
p-values
BMD, g/cm2
Whole body 1.10 (0.15) 1.13 (0.14)    0.05
 Age < 20y    1.01 (0.13) 1.06 (0.16) 0.02
 Age ≥ 20y    1.18 (0.10) 1.19 (0.08) 0.71
Lumbar spine, L2-L4 1.12 (0.23) 1.17 (0.22)    0.07
 Age < 20y    0.99 (0.21) 1.07 (0.27) 0.04
 Age ≥ 20y    1.24 (0.18) 1.26 (0.11) 0.52
Total hip
 Age ≥ 20y    1.00 (0.18) 1.05 (0.14) 0.10
Ultra distal radius
 Age ≥ 20y    0.48 (0.08) 0.5 (0.08) 0.13
Forearm
 Age ≥ 20y    0.87 (0.09) 0.93 (0.11) 0.01
Z-score
Whole body −0.07 (1.08) 0.27 (0.90)    0.06
 Age < 20y    −0.39 (0.99) 0.28 (1.01) 0.01
 Age ≥ 20y    0.21 (1.10) 0.26 (0.71) 0.83
Lumbar spine, L2-L4 −0.16 (1.2) 0.4 (1.02)    0.07
 Age < 20y    −0.39 (1.01) 0.25 (1.21) 0.04
 Age ≥ 20y    0.06 (1.34) 0.24 (0.84) 0.56
Total hip
 Age ≥ 20y    −0.32 (1.35) 0.14 (0.99) 0.10
Ultra distal radius
 Age ≥ 20y    −0.42 (1.36) 0.16 (1.33) 0.13
Forearm
 Age ≥ 20y    −0.76 (1.03) −0.05 (0.87) 0.01
T-score
  ≥ 20y
Whole body NA NA 0.16 (1.25) 0.29 (0.82) 0.81
Lumbar spine, L2-L4 NA NA 0.00 (1.44) 0.25 (0.92) 0.09
Total hip NA NA 0.42 (1.41) 0.07 (1.04) 0.07
Ultra distal radius NA NA −0.43 (1.35) 0.14 (1.35) 0.48
Forearm NA NA −0.77 (1.00) −0.07 (0.87) 0.38
  1. BMD bone mineral density, y years. Values for total hip, ultra distal and forearm are not applicable for age < 20y. Values are mean (SD). p-values when comparing patients and controls using paired samples t-test