Table 3.
Association between social network dimensions and transition to injection-use from non-injection use
| Variable | Model 1a |
Model 2b |
Model 3c |
|||
|---|---|---|---|---|---|---|
| aOR | 95% CI | aOR | 95% CI | aOR | 95% CI | |
| Network relations | ||||||
| Number of family member alters | 1.01 | (0.85, 1.21) | 0.93 | (0.75, 1.16) | 1.06 | (0.70, 1.61) |
| Number of friend alters | 1.07 | (0.98, 1.16) | 1.01 | (0.88, 1.61) | 1.04 | (0.83, 1.31) |
| Number of sex partner alters | 1.58 | (1.13, 2.22)** | 1.58 | (1.05, 2.38)* | 2.17 | (1.26, 3.75)** |
| Trust in alters | 1.19 | (0.85, 1.68) | 1.12 | (0.79, 1.58) | 1.22 | (0.82, 1.82) |
| Closeness to alters | 1.01 | (0.66, 1.54) | 1.08 | (0.69, 1.69) | 1.21 | (0.74, 1.98) |
| Network structures | ||||||
| Total network size | 1.08 | (0.95, 1.24) | 0.94 | (0.77, 1.16) | ||
| Network density | 2.04 | (0.82, 5.08) | 2.54 | (0.96, 6.73) | ||
| Network functions | ||||||
| Tangible support | ||||||
| From injection drug user alters | 0.98 | (0.93, 1.03) | ||||
| From sex partner alters | 0.96 | (0.91, 1.01) | ||||
| From family member alters | 0.99 | (0.95, 1.04) | ||||
| From friend alters | 1.01 | (0.99, 1.03) | ||||
| Social norms relating to injection drug use | ||||||
| Total number of network alters who encouraged egos to inject drugs (subjective norms) | 1.00 | (0.76, 1.30) | ||||
| Total number of network alters who encouraged egos to not inject drugs (subjective norms) | 1.06 | (0.97, 1.16) | ||||
| Total number of network alters who are injection drug users (descriptive norms) | 1.69 | (1.24, 2.31)** | ||||
| Socio-demographic characteristics | ||||||
| Ego’s age (years) | 1.25 | (1.19, 1.32)** | 1.26 | (1.19, 1.33)** | 1.24 | (1.17, 1.31)** |
| Total number of years spent in formal schooling | 1.12 | (1.01, 1.24)* | 1.12 | (1.01, 1.24)* | 1.14 | (1.02, 1.23)* |
| Han ethnicity | 1.46 | (0.88, 2.40) | 1.42 | (0.85, 2.36) | 1.43 | (0.83, 2.47) |
| Unemployed | 2.66 | (1.55, 4.57)** | 2.67 | (1.54, 4.65)** | 2.33 | (1.31, 4.15)** |
aOR Adjusted odds ratios; 95%CI 95% confidence intervals;
*
P ≤ 0.05;
**
P ≤ 0.01
a
Model 1 = Network relation variables only, adjusted for socio-demographic characteristics
b
Model 2 = Network relation and structural variables only, adjusted for socio-demographic characteristics
c
Model 3 = Final model containing network relation, structural and functional variables, adjusted for socio-demographic characteristics