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. 2021 Jan 15;7(1):e17173. doi: 10.2196/17173

Table 2.

Interval-level characteristics of sexual acts among 1311 adult Blued app users in 4 provinces in China who reported engaging in both unprotected and protected anal sex in the past 6 months.

Characteristic All participants (N=1311) UAIa No UAIb

UAIa, n (%) No UAIb, n (%) Offlinec (n=292), n (%) Onlined (n=1019), n (%) P value Offlinec (n=214), n (%) Onlined (n=1097), n (%) P value
Partnership type








One-time partner 608 (46.4) 668 (51.0) 72 (24.7) 536 (52.6) <.001 66 (30.8) 602 (54.9) <.001

Casual partner 433 (33.0) 410 (31.3) 136 (46.6) 297 (29.1) <.001 90 (42.1) 320 (29.2) <.001

Main partner 270 (20.6) 233 (17.8) 84 (28.8) 186 (18.3) <.001 58 (27.1) 175 (16.0) <.001
Partner’s HIV status


Negative 395 (30.1) 344 (26.2) 123 (42.1) 272 (26.7) <.001 89 (41.6) 255 (23.2) <.001

Positive 45 (3.4) 55 (4.2) 12 (4.1) 33 (3.2) .47 14 (6.5) 41 (3.7) .06

Not sure 871 (66.4) 912 (69.6) 157 (53.8) 714 (70.1) <.001 111 (51.9) 801 (73.0) <.001
Participant’s sexual role


Receptive 622 (47.4) 628 (47.9) 124 (42.5) 498 (48.9) .05 87 (40.7) 541 (49.3) .02

Insertive 524 (40.0) 501 (38.2) 130 (44.5) 394 (38.7) .07 92 (43.0) 409 (37.3) .12

Both 165 (12.6) 182 (13.9) 38 (13.0) 127 (12.5) .80 35 (16.4) 147 (13.4) .25
Participant’s substance use before sex (vs no use) 89 (6.8) 96 (7.3) 25 (8.6) 64 (6.3) .17 23 (10.7) 73 (6.7) .04

aUAI: unprotected anal sex interval.

bNo UAI: protected anal sex interval.

cOffline: initiated partnership offline.

dOnline: initiated partnership online.