Table 1.

Key characteristics of study participants by HIV status, Informal Medical Injection Study (n=500), Cambodia, 2017

Sociodemographics	HIV+ (n=250)		HIV− (n=250)		P value
	n	%	n	%
Gender
Female	164	65.6	177	70.8	0.21
Male	86	34.4	73	29.2
Age* (mean, SD)	(43.1, 9.0)		(30.6, 10.7)		<0.001
Marital status
Single	15	6.0	87	34.8	<0.001
Married	140	56.0	141	56.4
Divorced	41	16.4	15	6.0
Widowed	54	21.6	7	2.8
Education
Secondary or higher	104	41.6	163	65.2	<0.001
Primary or less	146	58.4	87	34.8
Occupation*
Unemployed	81	32.7	126	50.8	<0.001
Self-employed/farmers	95	38.3	70	28.2
Employed	72	29.0	52	21.0
Household annual income*† (US$)
>3000	40	22.9	44	22.8	0.48
1800–3000	45	25.7	42	21.8
1001–1800	39	22.3	56	29.0
≤1000	51	29.1	51	26.4
Current address*
Province	227	90.8	231	92.8	0.42
Phnom Penh (capital city)	23	9.2	18	7.2
Other behavioural risk factors‡
Smoke monthly or more often	30	12.0	13	5.2	<0.01
Feeling drunk at least once a month	45	18.0	63	25.2	0.05
Contact with syringe and needle at workplace	8	3.2	36	15.5	<0.01
Had at least one hospitalisation	42	23.5	87	49.2	<0.001

*Missing (HIV+ and HIV−, respectively): age (n=5, n=5); occupation (n=2, n=2); current address (n=0, n=1).

†The categories for household income used quartiles to assure sufficient numbers in each category.

‡Self-report over the past year.