Estimate | Std. Error | T Value | Pr (< |t|) | |
---|---|---|---|---|

Baseline intercept^{a} | 178.79 | 9.05 | 19.75 | <.0001 |

Baseline slope CT^{b} | 15.6 | 0.39 | 39.84 | <.0001 |

Diff. intercept size^{c} | ||||

10–14 mm | −52.93 | 12.8 | −4.13 | .0001 |

15–19 mm | −37.7 | 12.8 | −2.94 | .0043 |

20–29 mm | 29.41 | 12.8 | 2.3 | .0245 |

30–39 mm | −74.14 | 12.8 | −5.79 | <.0001 |

>40 mm | −77.87 | 12.8 | −6.08 | <.0001 |

Diff. slope CT:size^{d} | ||||

10–14 mm | −12.47 | 0.55 | −22.52 | <.0001 |

15–19 mm | −8.72 | 0.55 | −15.75 | <.0001 |

20–29 mm | −11.5 | 0.55 | −20.77 | <.0001 |

30–39 mm | −10.28 | 0.55 | −18.57 | <.0001 |

>40 mm | −13.12 | 0.55 | −23.69 | <.0001 |

**Note:**—The estimated coefficients indicate how changes in CT imaging volume, tumor size, and interaction between these 2 factors would affect thyroid cancer incidence compared with the baseline number of cases of size < 10 mm in 1993.↵a Baseline intercept term is the estimated incidence in the year 1993.

↵b Baseline slope CT refers to the rate of increase in cases per million CT scans for tumors < 10 mm since 1993.

↵c Diff. intercept size indicates how much the intercept changes for other sized tumors.

↵d Diff. slope CT:size indicates how much the slope changes for other sized tumors. A negative estimate value indicates that the intercept or slope would be lower than for the baseline case of size < 10 mm.