Table 1.

Mean HIV transmission knowledge score by study participant characteristics.

	Mean HIV Knowledge score (sd)	95% CI	p-value (Student’s t)	p-value (bootstrap with network cluster)*
Full sample	8.97 (1.73)	8.87–9.06
HIV Status
Negative	9.01 (1.72)	8.89–9.12
Positive	8.89 (1.76)	8.73–9.04	0.208	0.213
Age
18–29	9.14 (1.56)	8.97–9.31
30–39	8.95 (1.77)	8.83–9.08
40–49	8.79 (1.80)	8.58–9.00	0.048 (ANOVA)	0.180
Gender
Female	8.89 (1.66)	8.22–9.55
Male	8.97 (1.73)	8.87–9.06	0.810	0.810
Education
No School/Primary	8.09 (2.10)	7.75–8.43
Some Secondary	8.84 (1.76)	8.70–8.99
Secondary	9.26 (1.50)	9.11–9.40
College or Vocational	9.30 (1.57)	9.10–9.51	<0.001 (ANOVA)	0.001
Income
Lowest Quartile	8.91 (1.80)	8.73–9.09
Second Quartile	9.08 (1.57)	8.90–9.26
Third Quartile	8.92(1.80)	8.74–9.09
Highest Quartile	8.99 (1.69)	8.79–9.20	0.547	0.553
Treatment Program
Never	8.88 (1.76)	8.77–9.00
Ever	9.12 (1.67)	8.97–9.27	0.017	0.010
Number of peers in injecting group
1–2	9.07 (1.57)	8.93–9.20
3–4	8.79 (1.87)	8.63–8.96
5+	9.07 (1.71)	8.88–9.26	0.016 (ANOVA)	0.204
Gave a used needle to others for re–use
In the past 3 mo.	8.86 (1.82)	8.64–9.07
Not in the past 3 mo.	9.34 (1.52)	9.08–9.61	0.011	0.006
Took a used needle from another for re–use
In the past 3 mo.	8.67 (1.90)	8.41–8.92
Not in the past 3 mo.	9.28 (1.54)	9.06–9.51	0.001	0.001
Frequency of injecting, in past 3 months
Every day	8.95 (1.76)	8.83–9.17
Less than every day	9.00 (1.64)	8.85–9.06	0.669	0.652
Condom use, past 12 months
Consistent	8.87 (1.79)	8.67–9.07
Less than consistent	8.93 (1.72)	8.79–9.06	0.637	0.603

^*To calculate p-values that accounted for clustering within injection networks, 100 bootstrap replicates of the sample were drawn, by network cluster. Bootstrapping was used because the correlation structure of the networks was not known.

CI: Confidence Interval