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Forest plot of the effect on muscular strength of the different types of exercise, exercise of limbs and postural muscle vs no exercise (3.1.1), respiratory muscle training (RMT) and breathing exercises vs no exercise (3.1.2), and RMT vs placebo (3.1.3) in persons with Duchenne muscular dystrophy (DMD). 95% CI: 95% confidence interval; df: degrees of freedom; I2: measure of heterogeneity; Tau2: measure of variance; SD: standard deviation.
