年份	阳性率(%)						χ²	P
年份	0~< 6M	6M~< 1Y	1Y~< 2Y	2Y~< 3Y	3~< 4Y	4~≤ 5Y	χ²	P
2010	26.80	44.31	52.14	21.88	12.50	60.00	34.791	0.000
2011	27.48	43.31	52.99	30.43	28.57	14.29	37.849	0.000
2012	13.88	33.22	44.84	33.33	21.43	22.22	100.682	0.000
2013	11.05	30.50	46.86	21.15	25.00	5.26	193.105	0.000
2014	3.79	26.75	57.48	22.41	23.08	10.64	292.115	0.000
2015	4.82	19.51	23.08	18.00	12.50	3.12	86.900	0.000
2016	13.89	22.97	34.78	41.86	20.00	8.33	75.720	0.000
2017	20.35	23.51	38.58	37.14	26.67	10.78	58.552	0.000
2018	18.49	21.96	37.92	30.99	38.89	15.33	60.142	0.000
2019	15.34	12.99	24.91	32.14	10.71	20.93	59.250	0.000
总计	14.95	28.09	39.17	29.26	21.24	13.94	34.791	0.000