Table 2.

Patterns of sexualized drug use in different reference periods.

Variables			One year prior to baseline survey (among MSMa who reported sexualized drug use in the past year at baseline, n=88), n (%)	During the 6-month follow-up period (among MSM who reported sexualized drug use during the follow-up, n=28), n (%)
Types of psychoactive substance used during chemsex
	Ketamine		2 (2.3)	2 (7.1)
	Methamphetamine		32 (36.4)	11 (39.3)
	Cocaine		0 (0.0)	0 (0.0)
	Cannabis		7 (8.0)	1 (3.6)
	Ecstasy		2 (2.3)	2 (7.1)
	Dormicum/Halcion/Erimin 5/Hypnotic drugs (nonprescription)		0 (0.0)	1 (3.6)
	Heroin		0 (0.0)	0 (0.0)
	Cough suppressant (not for curing cough)		1 (1.1)	2 (7.1)
	Amyl nitrite		69 (78.4)	20 (71.4)
	γ-hydroxybutyrate (GHB/GBL)		29 (33.0)	10 (35.7)
	5-methoxy-N, N-diisopropyltryptamine		5 (5.7)	1 (3.6)
	Mephedrone		0 (0.0)	1 (3.6)
Poly-use of psychoactive substances
	No		57 (64.8)	14 (50.0)
	Yes		31 (35.2)	14 (50.0)
Frequency of sexualized drug use
	<1 episode/month		0 (0.0)	13 (46.4)
	1 episode/month		35 (39.8)	11 (39.3)
	1-2 episodes/month		24 (27.3)	2 (7.1)
	≥3 episodes/month		29 (33.0)	2 (7.1)
Condomless anal intercourse during sexualized drug use
	No		41 (46.6)	10 (35.7)
	Yes		47 (53.4)	18 (64.3)
Characteristics of most recent episode of sexualized drug use
	Number of participants
		2	67 (76.1)	19 (67.9)
		≥3	21 (23.9)	9 (32.1)
	Alcohol consumption
		No	77 (87.5)	28 (100.0)
		Yes	11 (12.5)	0 (0.0)
	Use of erectile dysfunction drugs
		No	62 (70.5)	16 (57.9)
		Yes	26 (29.5)	12 (42.1)
	Group sex
		No	18 (20.5)	11 (39.3)
		Yes	70 (79.5)	17 (60.7)
	Condomless anal intercourse
		No	45 (51.1)	15 (53.6)
		Yes	43 (48.9)	13 (46.4)

^aMSM: men who have sex with men.