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Effect of dystrophin on ages at start of noninvasive ventilation and tracheotomy and on vital capacity (VC). Kaplan–Meier analysis compares ages at start of noninvasive ventilation (A), tracheotomy (B), VC < 50% (C), and VC < 20% (D) between groups A, B, and C. Subsequent pairwise comparisons were used with Bonferroni correction for multiple comparisons. Probability values are shown on the right side of the diagram. CI = confidence interval; NS = non‐significant.
