Association of nitrite inhalants use and unprotected anal intercourse and HIV/syphilis infection among MSM in China: a systematic review and meta-analysis

Zhang, Yonghui; Bao, Rantong; Leuba, Sequoia I.; Li, Jiaming; Wang, Hongyi; Zhang, Jing; Chu, Zhenxing; Geng, Wenqing; Jiang, Yongjun; Xu, Junjie

doi:10.1186/s12889-020-09405-x

Table 3 Venue for seeking sex partners/Sexual behaviors among MSM who use nitrite inhalants and among MSM who do not use nitrite inhalants in China

From: Association of nitrite inhalants use and unprotected anal intercourse and HIV/syphilis infection among MSM in China: a systematic review and meta-analysis

Study	Venue for seeking sex partners/Sexual Behaviors	nitrite inhalants users		nitrite inhalants nonusers		P-value
Study	Venue for seeking sex partners/Sexual Behaviors	N	%^a	N	%^a	P-value
Wang et al. (2017) [26]	Sexual role					0.001
	Insertive	41	27.3	144	42.9
	Receptive/Versatile	109	72.7	192	57.1
	No. of sex partners, P6M					< 0.001
	< 2	28	18.4	136	38.0
	≥2	124	81.6	222	62.0
	CRAI, P6M	57	52.3	114	52.5	0.967
	Seeking male sex partners via the Internet	145	95.4	267	74.6	< 0.001
Zhao et al. (2017) [29]	Sexual role					0.013
	Insertive	93	30.7	431	38.4
	Receptive/Versatile	210	69.3	690	61.6
	Gay apps users^c	220	72.6	604	53.9	< 0.001
Xu et al. (2017) [14]	Sexual role					0.003
	Insertive	65	26.4	291	36.6
	Receptive/Versatile	181	73.6	503	63.4
	No. of sex partners, P6M					< 0.001
	≤1	66	26.8	467	58.8
	≥2	180	73.2	327	41.2
	CAI with casual partners, P6M	83	33.7	152	19.1	< 0.001
	Venue for seeking sex partners					0.001
	Internet	202	82.1	570	71.8
	Others^d	44	17.9	224	28.2
Duan et al. (2017) [15]	Had receptive sexual intercourse, P6M	128	62.4	821	47.5	< 0.001
	Multiple sex partners (≥2), P6M	157	76.6	828	47.9	< 0.001
	Seeking male sex partners by Internet	164	86.3	704	60.2	< 0.001
Zhang et al. (2016) [21]	Sexual role					< 0.001
	Insertive	268	30.0	863	40.9
	Receptive/Versatile	626	70.0	1249	59.1
	No. of male sex partners, P3M					< 0.001
	≤1	372	38.7	1507	57.4
	≥2	589	61.3	1120	42.6
	CRAI, P3M	298	31.0	547	20.8	< 0.001
	Most common venue for seeking male partners					< 0.001
	Internet	834	86.8	2004	76.3
	Other^e	127	13.2	623	23.7
Chen et al. (2016) [24]	Sexual role, recently					0.800
	Insertive	44	36.1	262	37.3
	Receptive/Versatile	78	63.9	441	62.7
	No. of casual partners ≥1, P3M	68	55.7	310	44.1	0.017
	Multiple sex partners (≥2), P3M	45	36.9	188	26.7	0.023
Li et al. (2014) [25]	Had a casual sex partner, P3M	135	71.4	126	59.7	0.014
	Venue for seeking sex partners					< 0.001
	Internet	158	83.6	130	61.6
	Others^f	31	16.4	81	38.4
Li (2014) [19]	Sexual role					0.238
	Insertive	186	29.5	695	32.0
	Receptive/Versatile	445	70.5	1480	68.0
	No. of partners, P6M					0.003
	≤3	372	59.0	1423	65.4
	> 3	259	41.0	752	34.6
	Seeking sex partners via the Internet	554	87.8	1470	67.6	< 0.001
Chu (2013)^g [17]	Sexual role					0.050
	Insertive	26	21.7	155	30.7
	Receptive/Versatile	94	78.3	350	69.3
	Seeking sex partners via the Internet	86	71.7	252	49.9	< 0.001

N/A Not available; “one for night”: one-night stands, CRAI Condomless receptive anal intercourse, CAI Condomless anal intercourse, P3M: in the past 3 months; P6M: in the past 6 months
^a The percent of non-missing observations. Percentages may not add up to 100 because of rounding
^b Venues for seeking sex partners included parks, public toilets, bars, clubs, and bathhouses
^c They had used gay smart phone-based sex-seeking applications in the last six months
^d Venues for seeking sex partners included parks, public toilets, bathhouses, bars, dance halls, and clubs
^e Venues for seeking male partners included parks, bathrooms, sauna and other public places
^f Venues for seeking sex partners included parks and bathrooms
^g This data was extracted from the baseline questionnaire of this study

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