Table 3.
Multivariable logistic and linear regression models to assess associations between Facebook communication and network features and HIV infection and transmission risk indicators (N=310).
| Independent variables | STIa incidenceb, ORc (95% CI) | Condomless sexb, OR (95% CI) | Sex drug useb, OR (95% CI) | Biomedical preventionb, OR (95% CI) | Depressiond, β (95% CI) | |
| Facebook communication features | ||||||
|
|
Sexual health content (stde) | 0.99 (0.73 to 1.33) | 1.58 (1.09 to 2.29)f | 1.22 (0.89 to 1.67) | 1.48 (1.00 to 2.20)g | −0.72 (−1.42 to −0.02)f |
|
|
Substance use content (std) | 1.06 (0.72 to 1.56) | 1.13 (0.81 to 1.58) | 1.81 (1.17 to 2.79)h | 0.89 (0.58 to 1.36) | −0.80 (−1.65 to 0.05)g |
|
|
Sex behavior content (std) | 0.88 (0.66 to 1.18) | 1.02 (0.72 to 1.43) | 1.02 (0.73 to 1.43) | 1.20 (0.82 to 1.77) | .63 (−0.03 to 1.04)g |
|
|
Ballroom culture content (std) | 1.24 (0.92 to 1.66) | 0.76 (0.63 to 0.93)h | 0.94 (0.76 to 1.18) | 0.06 (0.01 to 0.71)f | .80 (0.27 to 1.34)h |
|
|
Positive affect (std) | 0.81 (0.56 to 1.15) | 1.08 (0.83 to 1.42) | 0.73 (0.55 to 0.96)f | 0.85 (0.66 to 1.08) | .18 (−0.45 to 0.81) |
| Facebook network features | ||||||
|
|
Eigenvector centrality (std) | 1.22 (0.88 to 1.70) | 0.69 (0.52 to 0.92)f | 0.73 (0.55 to 0.96)f | 0.97 (0.69 to 1.36) | −0.90 (−1.60 to −0.21)f |
|
|
Brokerage (std) | 0.97 (0.61 to 1.54) | 0.74 (0.53 to 1.03)g | 0.71 (0.51 to 0.99)f | 0.78 (0.44 to 1.37) | −0.44 (−1.29 to 0.42) |
|
|
Local clustering coefficient (std) | 0.96 (0.61 to 1.51) | 0.78 (0.53 to 1.15) | 0.89 (0.60 to 1.30) | 1.13 (0.76 to 1.66) | .01 (−1.03 to 1.04) |
|
|
Facebook group count (std) | 0.82 (0.60 to 1.13) | 1.00 (0.78 to 1.30) | 1.01 (0.79 to 1.29) | 0.85 (0.66 to 1.10) | .84 (0.25 to 1.43)h |
| Controls | ||||||
|
|
HIV status (positive) | 1.84 (0.97 to 3.47)g | 0.90 (0.53 to 1.52) | 0.85 (0.51 to 1.40) | 3.20 (1.85 to 5.53)i | .30 (−1.02 to 1.62) |
|
|
Total number of posts (std) | 1.03 (0.62 to 1.72) | 0.75 (0.50 to 1.11) | 0.64 (0.40 to 1.03)g | 1.12 (0.68 to 1.84) | .65 (−0.60 to 1.90) |
|
|
STI incidence | —j | 2.66 (1.40 to 5.04)h | 1.00 (0.54 to 1.87) | 2.65 (1.43 to 4.89)h | .27 (−1.34 to 1.87) |
|
|
Condomless sex | 2.71 (1.44 to 5.55)h | — | 1.19 (0.70 to 2.01) | 0.90 (0.52 to 1.57) | −0.12 (−1.57 to 1.32) |
|
|
Sex drug use | 1.00 (0.51 to 1.72) | 1.18 (0.70 to 2.00) | — | 1.02 (0.59 to 1.76) | 2.69 (1.27 to 4.11)i |
|
|
Biomedical prevention | 2.59 (1.42 to 4.73)h | 0.85 (0.49 to 1.48) | 0.92 (0.53 to 1.58) | — | −0.34 (−1.70 to 1.02) |
|
|
Depression (std) | 1.05 (0.77 to 1.44) | 0.98 (0.76 to 1.27) | 1.64 (1.27 to 2.11)i | 0.90 (0.69 to 1.17) | — |
|
|
Intercept | 0.07 (0.03 to 0.15)i | 1.46 (0.91 to 2.33) | 0.96 (0.59 to 1.57) | 0.17 (0.09 to 0.35)i | 8.05 (6.58 to 9.52)i |
aSTI: sexually transmitted infection.
bLogistic regression model.
cOR: odds ratio.
dLinear regression model.
eStd: SD unit change.
fP<.05.
gP<.10.
hP<.01.
iP<.001.
jOutcome variable; excluded as a covariate.