Table 3.

The risk grading of patients between two periods

Risk Grading	2015.10-2016.7		2016.8-2017.5		P value*
	Nodules no.	Patients no**.	Nodules no.	Patients no**.
0, Low risk	64(8.5%)	3(1.5%)	45(7.2%)	2(1.1%)	Nodules: 0.267
1, Medium risk	278(36.8%)	27(13.9%)	237(37.9%)	26(13.8%)
2, High risk	79(10.4%)	9(4.6%)	49(7.8%)	8(4.3%)	Patients: 0.975
3, Very high risk	335(44.3%)	155(80.0%)	295(47.1%)	152(80.8%)

* P value was calculated using the Chi-square test.

** The risk of patients was determined based on the highest risk of their nodules.