IRR | Standard error | P value | 95% CI | |

Women (n=7968) | ||||

Intercept | 1.32 | 0.03 | 0.00 | 1.26 to 1.39 |

Change in level (immediate) | 0.79 | 0.03 | 0.00 | 0.74 to 0.84 |

Change in slope (gradual) | 0.52 | 0.02 | 0.00 | 0.50 to 0.54 |

Slope before intervention | 1.72 | 0.02 | 0.00 | 1.66 to 1.77 |

Men (n=2468) | ||||

Intercept | 1.40 | 0.05 | 0.00 | 1.27 to 1.53 |

Change in level (immediate) | 0.84 | 0.06 | 0.00 | 0.76 to 0.94 |

Change in slope (gradual) | 0.51 | 0.04 | 0.00 | 0.47 to 0.55 |

Slope before intervention | 1.76 | 0.03 | 0.00 | 1.66 to 1.87 |

Lowest age tertile (19–29 years) (n=3882) | ||||

Intercept | 0.89 | 0.05 | 0.01 | 0.81 to 0.97 |

Change in level (immediate) | 0.76 | 0.06 | 0.00 | 0.68 to 0.86 |

Change in slope (gradual) | 0.55 | 0.04 | 0.00 | 0.51 to 0.59 |

Slope before intervention | 1.72 | 0.03 | 0.00 | 1.62 to 1.82 |

Intermediate age tertile 2 (30–38 years) (n=3118) | ||||

Intercept | 1.20 | 0.04 | 0.00 | 1.10 to 1.30 |

Change in level (immediate) | 0.74 | 0.06 | 0.00 | 0.66 to 0.84 |

Change in slope (gradual) | 0.54 | 0.04 | 0.00 | 0.50 to 0.58 |

Slope before intervention | 1.68 | 0.03 | 0.00 | 1.59 to 1.78 |

Highest age tertile 3 (39–58 years) (n=3436) | ||||

Intercept | 1.98 | 0.03 | 0.00 | 1.87 to 2.11 |

Change in level (immediate) | 0.86 | 0.04 | 0.00 | 0.79 to 0.92 |

Change in slope (gradual) | 0.49 | 0.03 | 0.00 | 0.46 to 0.52 |

Slope before intervention | 1.76 | 0.02 | 0.00 | 1.69 to 1.83 |

Crude models.

GEE, generalised estimating equation; IRR, incidence rate ratio; ITS, interrupted time series.