Table 2.

Bivariate analysis showing differences in social network dimensions among injectors and non-injectors

Variable	Injectors		Non-injectors		OR	95% CI
	Mean (SD)	Median	Mean (SD)	Median
Network relations
Number of family member alters	1.26 (1.45)	1	1.53 (1.58)	1	0.89	(0.78, 1.01)
Number of friend alters	4.34 (3.38)	4	3.38 (3.04)	3	1.01	(1.01, 1.21)*
Number of sex partner alters	0.54 (0.95)	0	0.28 (0.67)	0	1.51	(1.14, 1.99)**
Trust in alters	3.98 (1.10)	4.09	4.02 (1.18)	4	0.97	(0.81, 1.15)
Closeness to alters	2.40 (0.82)	2.29	2.50 (0.83)	2.50	0.86	(0.68, 1.10)
Network structures
Total network size	8.43 (3.50)	8	6.81 (3.59)	6	1.14	(1.06, 1.23)**
Network density	0.61 (0.31)	0.60	0.60 (0.32)	0.60	1.09	(0.57, 2.08)
Network functions
Tangible support
From injecting heroin-user alters	8.44 (10.55)	5	2.76 (7.58)	0	1.08	(1.03, 1.13)**
From sex partner alters	8.88 (8.41)	9	6.95 (7.38)	7	1.03	(1.01, 1.06)*
From family member alters	11.56 (12.98)	11	13.24 (13.71)	10	0.99	(0.98, 1.01)
From friend alters	29.11 (27.45)	24	20.65 (21.93)	15	1.02	(1.003, 1.03)**
Emotional support
From injection drug user alters	8.84 (10.46)	6	2.99 (7.86)	0	1.08	(1.04, 1.13)**
From sex partner alters	8.14 (7.78)	8	6.14 (6.63)	6	1.04	(1.01, 1.07)**
From family member alters	9.58 (11.71)	7	11.46 (12.75)	8	0.99	(0.97, 1.004)
From friend alters	28.92 (27.35)	23	20.82 (21.62)	15	1.02	(1.002, 1.03)*
Social norms relating to injection-use
Total number of network alters who     encouraged egos to inject drugs (subjective norms)	1.33 (1.74)	1	0.67 (1.31)	0	1.35	(1.12, 1.63)**
Total number of network alters who     encouraged egos to not inject drugs (subjective norms)	3.56 (3.26)	3	3.20 (3.67)	3	1.03	(0.97, 1.10)
Total number of alters who are injection drug     Users (descriptive norms)	2.42 (2.15)	2	0.83 (1.63)	0	1.59	(1.33, 1.91)**

SD standard deviation, OR crude odds ratios, 95% CI 95% confidence intervals

^*P ≤ 0.05

^**P≤ 0.01