Table 7a.

Regression model to assess effect of variable interactions on wrist VM/min wear in patients with DMD

Variable or variable interaction	Coefficient value	95% confidence interval	p-value
Ambulation status	–332	–1736, 1071	0.635
Age	–106	–166, –46	<0.001
Steroid status	111	–1078, 1300	0.851
Ambulation status &age interaction	96.7	–25, 218	0.116
Corticosteroid use &age interaction	2.0	–72, 77	0.956

Regression R² = 0.7758, adjusted R² = 0.7463, p-value <0.001; Regression equation: y = a_o + a₁x₁ + a₂x₂ + a₃x₃ + a₄x₁x₂ + a₅x₃x₂; Variables definitions (units): y = wrist VM/min wear (VM/min), x₁ = ambulation status (0 = non-ambulatory, 1 = ambulatory), x₂ = age (years), x₃ = corticosteroid use (0 = not-taking, 1 = taking).