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Table 5 Differences in relative muscle volume between RA, Pso and PsA patients after adjustment for age and age and BMI as independent covariates

From: Quantification of hand muscle volume and composition in patients with rheumatoid arthritis, psoriatic arthritis and psoriasis

 Age 20–80 yearsAge 40–80 years
VMrel / malesageage & BMI
(SBMI)
ageage & BMI
(SBMI)
RA – Psop < 0.0001 Δ = − 0.040p < 0.001 Δ = − 0.045p < 0.0001 Δ = − 0.041p < 0.0001 Δ = − 0.039
PsA – Pson.s.p = 0.05Δ = − 0.021n.s.n.s.
RA – PsAp < 0.0001 Δ = − 0.033p = 0.02 Δ = − 0.023p < 0.0001 Δ = − 0.045p = 0.02 Δ = − 0.024
VMrel / females
RA – Psop = 0.01 Δ = − 0.023p = 0.09 Δ = + 0.020p = 0.03 Δ = − 0.022p = 0.03 Δ = − 0.020
PsA – Pson.s.n.s.n.s.p = 0.05 Δ = − 0.019
RA – PsAn.s.n.s.n.s.n.s.
  1. Δ denotes the VMrel difference between two groups, on average in the denoted age interval. VMrel ranges between 0 and 1, thus Δ*100 stands for the percentage point difference of relative muscle volume. Data after age and BMI adjustment were only obtained in subgroup SBMI. The calculations are repeated for the age group 40–80 years (two most-right columns)