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Table 3 Subgroup analyses of online intervention in randomized controlled trial in China, 2011

From: Online HIV prevention intervention on condomless sex among men who have sex with men: a web-based randomized controlled trial

Subgroup Standard referral
n/N (%)
Online Intervention
n/N (%)
Difference in proportions
% (95% CI)
P value for interaction
Educational attainment     
 Middle school or lower 9/19 (47.4) 5/14 (35.7) 11.7 (−32.4, 55.7) 0.012
 High school 45/94 (47.9) 29/76 (38.2) 9.7 (−10.0, 29.4)
 College or above 178/372 (47.8) 159/411 (38.7) 9.1 (−0.1, 18.4)
Marital status     
 Currently married 34/69 (49.3) 18/45 (40.0) 9.3 (−15.5, 34.1) 0.005
 Singlea 198/416 (47.6) 175/456 (38.4) 9.2 (0.5, 18.0)
Annual income (US dollar)
 No income 16/48 (33.3) 15/35 (42.9) −9.6 (−36.7, 17.6) 0.445
 Less than $5,351 89/183 (48.6) 48/145 (33.1) 15.5 (1.8, 29.3)
 $5351 to 12,485 82/167 (49.1) 82/220 (37.3) 11.8 (−1.5, 25.2)
 $12,485 or above 45/87 (51.7) 48/101 (47.5) 4.2 (−16.0, 24.4)
Places of meeting sex partner
 Internet 209/432 (48.4) 165/439 (37.6) 10.8 (2.1, 19.5) 0.092
 Other 23/53 (43.4) 28/62 (45.2) −1.8 (−26.1, 22.6)
Awareness of AIDS-related knowledge
 Yes 219/456 (48.0) 183/474 (38.6) 9.4 (1.0, 17.9) 0.010
 No 13/29 (44.8) 10/27 (37.0) 7.8 (−25.7, 41.3)
  1. aIncludes divorced and widowed