No. of subjects | 197 |

Gender, male/female, *n* | 110/87^{a} |

Age (*n* = 196 of 197), mean (SD), median, y | 9.6 (±6.8), 8.9 |

No. (%) with transtracheostomy ventilator support | 97 (49) |

No. (%) with noninvasive CPAP or BiPAP support | 98 (50) |

No. (%) with negative pressure device | 2 (1) |

Age of transtracheal subgroup (*N* = 96 of 97), mean (SD), median, y | 8.8 (±7.1), 6.0^{b} |

Age of noninvasive subgroup (*N* = 98), mean (SD), median, y | 10.3 (±6.6), 10.4^{b} |

Age at onset of mechanical ventilation >6 h/d (*N* = 89 of 197), mean (SD), median, y | 6.7 (±6.1), 5.8 |