Comparison group | IRR | IRR_{L} | IRR_{U} | Fisher exact two-sided P value |
---|---|---|---|---|

Normal kidney function | 1 | 1 | 1 | 1 |

Mildly reduced kidney function | 0.61 | 0.12 | 5.26 | 0.63 |

Moderately reduced kidney function | 2.27 | 0.56 | 20.00 | 0.41 |

Severely reduced kidney function | 5.26 | 0.37 | 71.43 | 0.12 |

IRR, incidence rate ratio; IRR

_{L}, lower bound of the incidence rate ratio; IRR_{U}, upper bound of the incidence rate ratio.