Table 1.

Downstream events: The proportion of the Ontario patients in each sub-LHIN group who had their first DNUS in 2012 who went on to other relevant tests, diagnoses, and surgery. The sub-LHIN groups are based on increasing age- and sex-adjusted rates of first neck ultrasound in adults.

EVENTOVERALL RATE, %SUB-LHIN GROUP 1 (LOWEST DNUS RATE), %SUB-LHIN GROUP 2, %SUB-LHIN GROUP 3, %SUB-LHIN GROUP 4, %SUB-LHIN GROUP 5 (HIGHEST DNUS RATE), %P VALUE*
Needle biopsy (FNAB)14.0616.0214.5114.1612.9813.09< .001
Another imaging test9.1012.5112.018.096.985.66< .001
Thyroid surgery3.043.183.353.062.782.64< .001
Other neck surgery2.974.243.722.722.331.93< .001
Any neck surgery6.017.427.075.785.114.57NA
Second DNUS24.3623.3623.9124.7724.1725.50.001
Thyroid cancer1.871.831.862.061.771.68.3028
Another neck cancer0.831.191.270.680.550.37< .001
Any neck cancer2.703.023.132.742.322.05NA
  • DNUS—diagnostic neck ultrasound, FNAB—fine-needle aspiration biopsy, LHIN—Local Health Integration Network, NA—not available.

  • * The Cochran-Armitage trend test was used.

  • The trend test was not performed, as results were sums of other values.