Control period n=721 | Experimental period n=317 | |

Age in years | n=720 | n=313 |

Mean (SD) | 70 (8.93) | 70 (8.55) |

Sex | n=721 | n=317 |

Male, n (%) | 430 (60) | 194 (61) |

Female, n (%) | 291 (40) | 123 (39) |

BMI (kg/m^{2}) | n=612 | n=316 |

Mean (SD) | 27 (4.69) | 27 (4.14) |

Smoking status | n=678 | n=317 |

Current, n (%) | 254 (38)* | 112 (35)* |

Former, n (%) | 375 (55)* | 118 (37)* |

Never, n (%) | 49 (7)* | 87 (27)* |

FWD in metres | n=674 | n=317 |

Median (IQR) | 260 (157–432) | 250 (150–400) |

MWD in metres | n=674 | n=317 |

Median (IQR) | 380 (235–620) | 360 (214–567) |

HRQoL (6–24) | n=691 | n=317 |

Median (IQR) | 16 (13–19)† | 15 (12–18)† |

*Significant difference (p<0.05) between control and experimental group (χ

^{2}test).†Significant difference (p<0.05) between control and experimental group (Mann-Whitney U test).

BMI, body mass index; FWD, functional walking distance; HRQoL, health-related quality of life; MWD, maximal walking distance; RO1, research objective.