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# Table 3
**Independent variables of the models for disease group total counts**

Variable | Type | Description | Selected in Flu group model | Selected in respiratory group model | Selected in factors group model |
---|---|---|---|---|---|

Day
| Continuous | Number of days since beginning of training period in 2006 | Yes | Yes | Yes |

Weekday
| Categorical | The day of the week (reference category ‘Monday’) | Yes | Yes | Yes |

sin.day, cos.day
| Continuous | Yearly seasonal harmonics $\mathit{\text{sin}}\phantom{\rule{.5em}{0ex}}\left(\frac{2\mathrm{\pi Day}}{365}\right)$ and$\mathit{\text{cos}}\phantom{\rule{.5em}{0ex}}\left(\frac{2\mathrm{\pi Day}}{365}\right)$ | Yes | Yes | Yes |

log1p.lagn
| Continuous |
log of the count for the n th day before, n = 1,2,…,7, plus 1
| Yes | Yes | Yes |

is.public.hol
| Binary | An indicator for whether or not it is a QLD State public holiday | Yes | Yes | No |

is.school.hol
| Binary | An indicator for whether or not it is a QLD State school holiday | Yes | No | No |

l2.mod
| Categorical | The subgroup of ICD-10 codes | Yes | Yes | Yes |

l2.mod*Day
| Interaction |
Interaction between the level 2 disease group and Day
| Yes | Yes | No |

l2.mod*Weekday
| Interaction |
Interaction between the level 2 disease group and Weekday
| Yes | Yes | Yes |

l2.mod*sin.day
| Interaction |
Interaction between the level 2 disease group and sin.day
| Yes | Yes | Yes |

l2.mod*cos.day
| Interaction |
Interaction between the level 2 disease group and cos.day
| Yes | Yes | Yes |

l2.mod*log1p.lag1
| Interaction |
Interaction between the level 2 disease group and log1p.lag1
| Yes | Yes | Yes |

Weekday* is.school.hol
| Interaction |
Interaction between the Weekday and whether or not it is a school holiday
| Yes | No | No |

Day*Weekday
| Interaction |
Interaction between Day and Weekday
| No | Yes | No |

Day*sin.day
| Interaction |
Interaction between Day and sin.day
| No | Yes | No |

Day*cos.day
| Interaction |
Interaction between Day and cos.day
| No | Yes | No |

Day*is.public.holiday
| Interaction |
Interaction between Day and is.public.holiday
| No | Yes | No |

Day*is.school.holiday
| Interaction |
Interaction between Day and is.school.holiday
| No | No | No |