Table 3.
Factors associated with potential transmission links.
| Attribute | Category | Total | 1–3 Links, n (%) | ≥4 Links, n (%) | Adjusted odds ratio | Odds ratio 95% CI | P-value |
|---|---|---|---|---|---|---|---|
| All | 639 | 441(69.0) | 198(31.0) | – | – | – | |
| Transmission risk (birth sex) | Hetero (F) | 149 | 119(79.9) | 30(20.1) | – | – | – |
| Hetero (M) | 243 | 196(80.7) | 47(19.3) | 1.14 | 0.5–2.62 | .758 | |
| Hetero (U) | 2 | 1(50.0) | 1(50.0) | 1.32 | 0.04–42.47 | .877 | |
| MSM | 13 | 7(53.8) | 6(46.2) | 5.22 | 1.03–26.56 | .046 | |
| IDUs | 207 | 97(46.9) | 110(53.1) | 5.17 | 2.13–12.52 | <.001 | |
| BT | 2 | 2 (100.0) | 0 (0.0) | 0.00 | N/A | .999 | |
| Unknown | 23 | 19 (82.6) | 4 (17.4) | 0.68 | 0.21–2.24 | .526 | |
| Region | Central | 26 | 20 (76.9) | 6 (23.1) | – | – | – |
| North | 11 | 10 (90.9) | 1 (9.1) | 0.18 | 0.02–1.81 | .145 | |
| East | 102 | 70 (68.6) | 32(31.4) | 0.90 | 0.32–2.55 | .846 | |
| Southwest | 500 | 341 (68.2) | 159 (31.8) | 1.09 | 0.42–2.85 | .853 | |
| Sampling Year | 2000–2007 | 193 | 100 (51.8) | 93 (48.2) | – | – | – |
| 2008–2011 | 173 | 113 (65.3) | 60 (34.7) | 0.71 | 0.4–1.25 | .236 | |
| 2012–2015 | 147 | 127 (86.4) | 20 (13.6) | 0.26 | 0.13–0.55 | <.001 | |
| 2016–2017 | 126 | 101 (80.2) | 25 (19.8) | 0.31 | 0.15–0.64 | <.001 | |
| Education level | Primary school | 174 | 113 (64.9) | 61 (35.1) | – | – | – |
| Middle school | 234 | 164 (70.1) | 70 (29.9) | 0.39 | 0.22–0.67 | <.001 | |
| High school | 111 | 74 (66.7) | 37 (33.3) | 0.52 | 0.28–0.96 | .038 | |
| College or higher | 55 | 38 (69.1) | 17 (30.9) | 0.44 | 0.19–1.01 | .053 | |
| Unknown | 65 | 52 (80.0) | 13 (20.0) | 0.25 | 0.08–0.78 | .017 | |
| Age at diagnosis | <20 | 16 | 11 (68.8) | 5 (31.3) | – | – | – |
| 20–29 | 148 | 103 (69.6) | 45 (30.4) | 0.75 | 0.23–2.47 | .633 | |
| 30–39 | 190 | 116 (61.1) | 74 (38.9) | 5.78 | 1.8–18.54 | .003 | |
| 40–49 | 129 | 82 (63.6) | 47 (36.4) | 1.38 | 0.26–2.98 | .847 | |
| 50–59 | 51 | 42 (82.4) | 9 (17.6) | 0.31 | 0.07–1.4 | .130 | |
| ≥60 | 62 | 48 (77.4) | 14 (22.6) | 1.42 | 0.36–5.58 | .619 | |
| Unknown | 43 | 39 (90.7) | 4 (9.3) | 0.00 | N/A | .999 | |
| Marital status | Single | 275 | 187 (68.0) | 88 (32.0) | – | – | – |
| Married | 265 | 180 (67.9) | 85 (32.1) | 0.89 | 0.55–1.45 | .651 | |
| Divorced or widowed | 34 | 24 (70.6) | 10 (29.4) | 1.44 | 0.52–4.01 | .484 | |
| Unknown | 65 | 50 (76.9) | 15 (23.1) | 0.62 | 0.23–1.7 | .358 |
Abbreviations: Hetero, heterosexual; MSM, men who have sex with men; IDUs, intravenous drug users; BT, blood transfusion; Unknown, data are not available; CI, confidence interval.