Variable | IRR (95% CI) | % Change | p Value |

Total clinical points | 0.999 (0.997 to 1.001) | −0.1% | 0.15 |

Total organisational points | 0.997 (0.995 to 0.999) | −0.3% | 0.005 |

% Satisfied with phone access | 0.996 (0.992 to 0.999) | −0.4% | 0.01 |

% Able to book 2 days ahead | 0.997 (0.994 to 0.999) | −0.3% | 0.005 |

% Able to get appointment in 48 h | 0.992 (0.986 to 0.997) | −0.8% | 0.002 |

% Able to book with a specific GP | 0.993 (0.988 to 0.998) | −0.7% | 0.005 |

% Satisfied with opening hours | 1.001 (0.994 to 1.008) | 0.1% | 0.83 |

Distance from hospital (miles) | 0.984 (0.977 to 0.991) | −1.6% | <0.0001 |

% of Practice male | 0.99 (0.966 to 1.014) | −1.0% | 0.38 |

Age (% of practice patients 65+ years) | 1.01 (1.00 to 1.03) | 1.0% | 0.01 |

Practice deprivation score | 1.01 (1.008 to 1.016) | 1.0% | <0.0001 |

% of Practice white ethnicity | 0.999 (0.996 to 1.002) | −0.1% | 0.29 |

Size of practice (no of patients) | 0.99998 (0.99997 to 0.99999) | −0.002% | 0.0005 |

Coronary heart disease prevalence | 1.11 (1.04 to 1.18) | 11% | 0.0004 |

% Response rate to access survey | 0.995 (0.98 to 1.01) | −0.5% | 0.053 |

N=145 for all variables.

Figures in the second column are incident rate ratios (IRR). Subtracting 1 from the IRR and then multiplying by 100 gives the percentage change in the expected admissions count for a 1 unit increase in the predictor. So for practice deprivation score, for every extra deprivation point, the expected admissions count increases by 1%. For distance, for every mile more distant from the practice, the expected admissions count decreases by 1.6%. IRR less than 1.0 represent decreases and IRR greater than 1.0 represent increases in the count. Statistical model: negative binomial regression, using log of the list size as the offset.

GP, general practitioner.