Table 2.

Odds ratios (OR), adjusted odds ratios (aOR) and 95% confidence intervals (CI) of combined demographic/environmental and individual factors associated with reporting public injecting in the last 6 months in Scotland, 2017–18.

	Totala, N	Reported public injecting in last 6 monthsb (% of N)	Overall sample (n = 1464, 240 reported public injecting)
			OR (95% CI)	p-value	aORe (95% CI)	p-value
Age (per year increase)	39.5	38.6	0.98 (0.96 to 0.99)	0.030	0.97 (0.95 to 0.99)	0.013
Homeless in last 6 months
No	1061	91 (9)	1	<0.001	1	<0.001
Yes	401	148 (37)	6.24 (4.64 to 8.38)		3.68 (2.61 to 5.19)
Number of times in prison since first injected drugs
Low number (5 incarcerations or less)	911	119 (13)	1	<0.001	1	0.102
High number (more than 5 incarcerations)	542	119 (22)	1.87 (1.41 to 2.47)		1.33 (0.94 to 1.88)
Received OST in last 6 months
No	217	66 (30)	1	<0.001	1	<0.001
Yes	1247	174 (14)	0.37 (0.27 to 0.51)		0.37 (0.24 to 0.56)
Injected cocaine in last 6 months
No	1010	111 (11)	1	<0.001	1	0.046
Yes	452	129 (29)	3.23 (2.44 to 4.29)		1.46 (1.00 to 2.13)
Alcohol consumption (>14 units per week) in the last year
No	1133	137 (12)	1	<0.001	1	<0.001
Yes	317	100 (32)	3.35 (2.49 to 4.51)		2.42 (1.69 to 3.44)
Average injection frequency in last 6 months
Low frequency (4 times per day or less)	1345	186 (14)	1	<0.001	1	<0.001
High frequency (4 or more times per day)	117	54 (46)	5.34 (3.59 to 7.92)		3.16 (1.93 to 5.18)
Recruitment region
Rest of Scotlandc	880	87 (10)	1		1
NHS Greater Glasgow and Clyded	365	51 (14)	1.48 (1.02 to 2.14)	0.037	2.25 (1.46 to 3.47)	<0.001
Glasgow city centre	219	102 (47)	7.95 (5.62 to 11.22)	<0.001	5.45 (3.48 to 8.54)	<0.001

^aExcludes missing data.

^bMay not add up to 240 PWID due to missing data.

^cExcluding NHS Greater Glasgow and Clyde.

^dExcluding Glasgow city centre.

^eAdjusted for all co-variates presented in the table.