Time_{all} | Average travel time to the nearest hospital in the population |

Time_{poor} | Average travel time to the nearest hospital for the poorest 10% of pixels |

Time_{rich} | Average travel time to the nearest hospital for the richest 10% of pixels |

**Optimi****s****ations** |

Efficiency | min(time_{all}) |

| Minimise overall travel time to the nearest hospital in the population |

Equity gap | min(abs(time_{poor} – time_{rich})) |

| Minimise absolute difference between travel time to the nearest hospital for the poorest and for the richest decile |