Difference Urinary Calcium (mg/d) | 95% CI | P for Trend | |
---|---|---|---|

Total calcium intake | |||

quartile 1 | Referent | ||

quartile 2 | 8 | (−1 to 16) | |

quartile 3 | 14 | (6 to 23) | |

quartile 4 | 18 | (10 to 27) | |

0.01 | |||

Dietary calcium intake (non-supplement users) | |||

quartile 1 | Referent | ||

quartile 2 | 5 | (−7 to 17) | |

quartile 3 | 9 | (−3 to 22) | |

quartile 4 | 11 | (−2 to 24) | |

0.05 | |||

Caffeine intake | |||

quartile 1 | Referent | ||

quartile 2 | 0 | (−8 to 8) | |

quartile 3 | 5 | (−3 to 13) | |

quartile 4 | 10 | (2 to 18) | |

0.004 | |||

Urinary magnesium | |||

quartile 1 | Referent | ||

quartile 2 | 29 | (21 to 37) | |

quartile 3 | 43 | (34 to 51) | |

quartile 4 | 71 | (62 to 81) | |

<0.001 | |||

Urinary sodium | |||

quartile 1 | Referent | ||

quartile 2 | 15 | (6 to 23) | |

quartile 3 | 20 | (11 to 28) | |

quartile 4 | 37 | (27 to 47) | |

<0.001 | |||

Urinary sulfate | |||

quartile 1 | Referent | ||

quartile 2 | 11 | (2 to 20) | |

quartile 3 | 22 | (13 to 31) | |

quartile 4 | 44 | (33 to 55) | |

<0.001 | |||

Urinary citrate | |||

quartile 1 | Referent | ||

quartile 2 | 21 | (13 to 30) | |

quartile 3 | 34 | (25 to 43) | |

quartile 4 | 61 | (51 to 70) | |

<0.001 | |||

Urinary phosphorus | |||

quartile 1 | Referent | ||

quartile 2 | 6 | (−3 to 14) | |

quartile 3 | 19 | (9 to 28) | |

quartile 4 | 37 | (26 to 48) | |

<0.001 | |||

Urinary volume | |||

quartile 1 | Referent | ||

quartile 2 | 17 | (8 to 25) | |

quartile 3 | 21 | (12 to 30) | |

quartile 4 | 24 | (14 to 33) | |

<0.001 | |||

Urinary potassium | |||

quartile 1 | Referent | ||

quartile 2 | −20 | (−11 to −28) | |

quartile 3 | −30 | (−21 to −40) | |

quartile 4 | −49 | (−39 to −59) | |

<0.001 |

↵a Adjusted for age, kidney stone history, cohort, weight, calcium intake, caffeine intake, thiazide use, history of gout, 24-h urinary excretion of creatinine, and other urinary factors. See Table 1 for median and 25

^{th}-75^{th}percentile values for each factor.