# Overall hospital quality star rating

## How measure categories are weighted

For each hospital, a hospital summary score is calculated by taking the weighted average of the hospital’s scores for each measure group or category. The table below shows the weight applied to each measure category. The hospital summary score is then used to calculate the overall hospital rating.

Measure Category | Weight Used in Calculation |
---|---|

Mortality | 22% |

Safety | 22% |

Readmission | 22% |

Patient Experience | 22% |

Effectiveness of Care | 4% |

Timeliness of Care | 4% |

Efficient Use of Medical Imaging | 4% |

Please note that these percentage weights are out of 100%. If a hospital has no measures in a certain measure category, the weight percentage is redistributed to the other categories.

For example, if a hospital had no measures in the efficient use of medical imaging category, the 4% weight would be distributed as 22.9% for the mortality, safety of care, readmission and patient experience groups. The effectiveness of care and timeliness of care categories would then each have a weight of 4.2%.