Effectiveness of Couple-Based HIV Counseling and Testing for Women Substance Users and Their Primary Male Partners: A Randomized Trial
Table 5
Comparison of proportions and means between couples-based HIV-CT and control conditions on selected risk behaviors at 9-month followup. statistic for differences in count data by treatment based on zero-inflated negative binomial regression.
Prior to 3-month self-reported HIV risk behavior at 9-month followup assessment
Couples HIV-CT (n)
Control HIV-CT (n)
Estimate (SE)
t statistic
P value
Injection risk with primary partnera
% receptive syringe sharingb
12.4 (18)
11.7 (13)
.90
# times receptive syringe sharingc
1.4 (18)
8.3 (13)
−1.47 (0.40)
−3.73
.0002
Vaginal sex risk with primary partner
% unprotected vaginal sex
75.0 (81)
82.6 (94)
.72
% condom use (vaginal sex)
23.5 (81)
21.3 (94)
.86
# unprotected vaginal sex acts
15.4 (81)
22.2 (94)
−0.37 (0.24)
−1.51
.13
Anal sex risk with primary partner
% unprotected anal sex
19.8 (81)
14.9 (94)
.43
% condom use (anal sex)d
27.8 (18)
35.7 (14)
.71
# unprotected anal sex acts
0.7 (81)
5.7 (94)
−2.13 (0.75)
−2.83
.005
Sexual risk with secondary partner(s)
% with secondary partner(s)
19.8 (81)
20.2 (94)
.99
% condom use (secondary partner)e
79.0 (16)
68.8 (19)
.70
# of secondary partners
0.8 (81)
0.4 (94)
0.70 (0.47)
1.49
.14
Injection risk with nonprimary partner
% who injected with NP partner(s)
9.9 (81)
5.3 (94)
.27
# times receptive syringe sharingf
0.1 (8)
1.4 (5)
−2.45 (1.41)
−1.73
.08
Subsample of injection drug users.
bFisher’s exact test used to assess differences in proportions between treatment conditions.
cRaw means shown for each treatment group. T statistic based on zero-inflated negative binomial regression for count data to assess group differences.
dSubsample of women reporting anal sex with primary partners.
eSubsample of women reporting at least 1 secondary sex partner.
fSubsample of women who injected with persons other than their primary sex partner.
