Table 3.

Incidence rate of high risk behavior by region of rural Sichuan province from 2011 to 2013^a

Region	2011			2012			2013
	No. of high risk behaviors	Follow-up person years	Incidence rate (%)	No. of high risk behaviors	Follow-up person years	Incidence rate (%)	No. of high risk behaviors	Follow-up person years	Incidence rate (%)	Annual rate of changea
1 CD	1109	4031.33	27.51	1418	12,234.69	11.59	1061	13,743.52	7.72	−0.47
2 ZG	254	1691.39	15.02	160	5333.33	3.00	78	5492.96	1.42	−0.69
3 PZ	4	41.07	9.74	11	168.20	6.54	123	409.32	30.05	0.77
4 LZ	337	1280.08	26.33	235	4234.23	5.55	88	4378.11	2.01	−0.72
5 DY	751	2722.03	27.59	115	5066.08	2.27	272	4857.14	5.60	−0.55
6 MY	448	2370.25	18.90	334	6972.86	4.79	81	5625.00	1.44	−0.72
7 GY	468	807.15	57.98	590	2327.42	25.35	244	1788.86	13.64	−0.51
8 SN	123	1470.52	8.36	77	2851.85	2.70	27	1985.29	1.36	−0.60
9 NJ	337	2523.60	13.35	260	5816.55	4.47	44	4313.73	1.02	−0.72
10 LS	244	422.82	57.71	423	1696.07	24.94	327	2070.93	15.79	−0.48
11 NC	572	1460.63	39.16	505	3454.17	14.62	259	2273.92	11.39	−0.46
12 MS	88	1145.18	7.68	92	3076.92	2.99	57	3097.83	1.84	−0.51
13 YB	309	950.19	32.52	655	4428.67	14.79	269	4151.23	6.48	−0.55
14 GA	247	784.79	31.47	85	2537.31	3.35	71	1977.72	3.59	−0.66
15 DZ	172	710.48	24.21	287	3235.63	8.87	205	3005.87	6.82	−0.47
16 YA	52	137.49	37.82	18	640.57	2.81	15	595.24	2.52	−0.74
17 BZ	297	526.01	56.46	496	3167.31	15.66	1369	2669.14	51.29	−0.05
18 ZY	222	1977.65	11.23	183	7093.02	2.58	38	6440.68	0.59	−0.77
19 LY	11	218.03	5.04	197	693.91	28.39	16	465.12	3.44	−0.17
Total	6045	25,270.70	23.92	6141	74,981.68	8.19	4644	69,313.43	6.70	−0.47

^aAnnual rate of change==$\sqrt[n]{a_n/a_0}$-1