Cases | Controls | |
---|---|---|

*Some individuals were employed for two or more separate periods; hence the mean age at leaving is longer than the sum of the mean at start and mean duration of employment. | ||

Age at start of employment (years) | ||

Mean | 37.2 | 37.1 |

Median | 37.7 | 37.7 |

SD | 8.4 | 8.4 |

Range | 15–50 | 15–50 |

Year of recruitment | ||

Mean/median | 1957 | 1957 |

Range | 1946–91 | 1946–91 |

Duration of employment (years) | ||

Mean | 11.5 | 12.5 |

Median | 9.7 | 10.6 |

SD | 9.7 | 10.7 |

Range | 1 month–40 years | 1 month–40 years |

Age on leaving* (years) | ||

Mean | 49.1 | 50.0 |

Median | 50.9 | 51.7 |

SD | 12.6 | 13.7 |

Range | 20–65 | 17–66 |