Table 2.
Factors associated with clustering in the CRF08_BC transmission network in multivariate logistic regression model.
| Attribute | Category | Likelihood of clustering, adjusted odds ratio | Odds ratio 95% CI | P-value |
|---|---|---|---|---|
| Transmission risk (birth sex) | Hetero (F) | – | – | – |
| Hetero (M) | 1.32 | 1.03–1.68 | .029 | |
| Hetero (U) | 2.49 | 0.35–17.82 | .365 | |
| MSM | 0.50 | 0.25–0.98 | .043 | |
| IDUs | 2.34 | 1.79–3.07 | <.001 | |
| BT | 0.85 | 0.17–4.28 | .847 | |
| Unknown | 0.81 | 0.49–1.35 | .414 | |
| Region | Central | – | – | – |
| North | 1.94 | 0.82–4.56 | .129 | |
| East | 1.89 | 1.15–3.12 | .012 | |
| Southwest | 2.04 | 1.31–3.2 | .002 | |
| Sampling year | 2000–2007 | – | – | – |
| 2008–2011 | 0.33 | 0.24–0.44 | <.001 | |
| 2012–2015 | 0.16 | 0.12–0.21 | <.001 | |
| 2016–2017 | 0.34 | 0.24–0.47 | <.001 | |
| Education level | Primary school | – | – | – |
| Middle school | 0.69 | 0.54–0.88 | .003 | |
| High school | 0.86 | 0.64–1.15 | .301 | |
| College or higher | 0.59 | 0.41–0.85 | .004 | |
| Unknown | 0.81 | 0.57–1.15 | .238 | |
| Age at diagnosis | <20 | – | – | – |
| 20–29 | 1.18 | 0.65–2.16 | .586 | |
| 30–39 | 1.96 | 1.08–3.58 | .028 | |
| 40–49 | 1.93 | 1.05–3.57 | .035 | |
| 50–59 | 1.29 | 0.66–2.49 | .455 | |
| ≥60 | 1.48 | 0.78–2.84 | .233 | |
| Unknown | 1.23 | 0.63–2.42 | .541 | |
| Marital status | Single | – | – | – |
| Married | 1.04 | 0.84–1.28 | .739 | |
| Divorced or widowed | 0.70 | 0.45–1.10 | .121 | |
| Unknown | 0.87 | 0.57–1.33 | .529 |
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.