Table 1. Socio-demographic Characteristics of Studied Subjects Based on Subtypes.
| Patients | CRF01_AE (%) | CRF07_BC (%) | Subtype B (n) | P value |
| Years* | ||||
| 2009 (n = 58) | 36(62.1) | 12(20.7) | 10(17.2) | 0.615 |
| 2010 (n = 57) | 41(71.9) | 11(19.3) | 5(8.8) | |
| 2011 (n = 59) | 37(62.7) | 18(30.5) | 4(6.8) | |
| 2012 (n = 75) | 49(65.3) | 22(29.3) | 4(5.3) | |
| 2013 (n = 27) | 13(48.1) | 14(51.9) | 0 | |
| Ethnicity (Han) | 176(100.0) | 77(100.0) | 23(100.0) | – |
| Age (average) | 22.8±1.9 | 22.6±2.1 | 22.3±1.9 | 0.480 |
| CD4+ T cell counts (cells/µl) | 415.5 (274.3–537.0) | 476.5 (339.3–617.5) | 475.0 (351.0–590.0) | 0.013 |
| Regions** | ||||
| Shanghai (n = 55) | 32(58.25) | 18(32.7) | 5(9.1) | – |
| North (n = 9) | 4(44.4) | 2(22.2) | 3(33.3) | |
| Northeast (n = 8) | 6(75.0) | 2(25.0) | 0 | |
| East (n = 118) | 83(70.3%) | 30(25.4) | 5(4.2) | |
| South Central (n = 34) | 22(64.7) | 6(17.6) | 6(17.6) | |
| Southwest (n = 39) | 26(66.7) | 10(25.6) | 3(7.7) | |
| Northwest (n = 4) | 2(50.0) | 1(25.0) | 1(25.0) | |
| Unknown (n = 9) | 1(11.1) | 8(88.9) | 0 | |
| Total (n = 276) | 176(63.8) | 77(27.9) | 23(8.3) |
*The year when blood samples were collected.
**Place of birth. North: Beijing, Hebei, Shanxi and Inner Mongolia; Northeast: Liaoning, Jilin, and Heilongjiang; East: Fujian, Shandong, Zhejiang, Anhui, JiangXi, and Jiangsu; South Central: Guangxi, Henan, Hubei, Hunan, Guangdong and Hainan; Southwest: Sichuan, Chongqing, Guizhou and Ynunan; Northwest: Shannxi, Gansu, Ningxia, Qinghai and Xinjiang.